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Document and Entity Information - USD ($) $ in Billions	12 Months Ended
Document and Entity Information - USD ($) $ in Billions	Mar. 31, 2018	May 01, 2018	Sep. 30, 2017
Document And Entity Information [Abstract]
Trading Symbol	CVLT
Entity Registrant Name	COMMVAULT SYSTEMS INC
Entity Central Index Key	0001169561
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		45,482,346
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2.6

Consolidated Balance Sheets - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Current assets:
Cash and cash equivalents	$ 330,784,000	$ 329,491,000
Short-term investments	131,637,000	120,693,000
Trade accounts receivable, net	162,119,000	140,084,000
Prepaid expenses and other current assets	22,248,000	15,791,000
Total current assets	646,788,000	606,059,000
Deferred tax assets, net	0	50,228,000
Property and equipment, net	128,612,000	132,319,000
Equity method investment	0	3,621,000
Deferred commissions cost	33,092,000	30,378,000
Other assets	10,150,000	7,273,000
Total assets	818,642,000	829,878,000
Current Liabilities:
Accounts payable	761,000	117,000
Accrued liabilities	82,299,000	78,701,000
Deferred revenue	241,113,000	209,099,000
Total current liabilities	324,173,000	287,917,000
Deferred revenue, less current portion	84,661,000	70,803,000
Deferred tax liabilities, net	2,430,000	0
Other liabilities	3,314,000	4,226,000
Commitments and contingencies (Note 6)
Stockholders’ equity:
Preferred stock, $0.01 par value: 50,000 shares authorized, no shares issued and outstanding at March 31, 2018 and 2017	0	0
Common stock, $0.01 par value, 250,000 shares authorized, 45,118 shares and 44,816 shares issued and outstanding at March 31, 2018 and 2017, respectively	450,000	447,000
Additional paid-in capital	782,764,000	694,477,000
Accumulated deficit	(373,678,000)	(215,677,000)
Accumulated other comprehensive loss	(5,472,000)	(12,315,000)
Total stockholders’ equity	404,064,000	466,932,000
Total liabilities and stockholders’ equity	$ 818,642,000	$ 829,878,000

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Mar. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	45,118,000	44,816,000
Common stock, shares outstanding (in shares)	45,118,000	44,816,000

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Software and products	$ 311,745	$ 290,668	$ 258,091
Services	387,648	354,337	335,676
Total revenues	699,393	645,005	593,767
Cost of revenues:
Software and products	7,223	3,045	2,385
Services	90,929	82,147	80,327
Total cost of revenues	98,152	85,192	82,712
Gross margin	601,241	559,813	511,055
Operating expenses:
Sales and marketing	410,727	383,933	349,199
Research and development	94,164	83,543	69,287
General and administrative	87,575	84,944	78,848
Depreciation and amortization	9,721	8,635	9,611
Total operating expenses	602,187	561,055	506,945
Income (loss) from operations	(946)	(1,242)	4,110
Interest expense	(1,161)	(957)	(933)
Interest income	2,228	1,163	862
Equity in loss of affiliate	(3,621)	(958)	(83)
Income (loss) before income taxes	(3,500)	(1,994)	3,956
Income tax expense (benefit)	58,400	(1,486)	2,236
Net income (loss)	$ (61,900)	$ (508)	$ 1,720
Net income (loss) per common share:
Basic (in dollars per share)	$ (1.37)	$ (0.01)	$ 0.04
Diluted (in dollars per share)	$ (1.37)	$ (0.01)	$ 0.04
Weighted average common shares outstanding:
Basic (in shares)	45,242	44,700	45,159
Diluted (in shares)	45,242	44,700	46,489

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (61,900)	$ (508)	$ 1,720
Other comprehensive income (loss):
Foreign currency translation adjustment	6,843	(3,106)	(1,705)
Comprehensive income (loss)	$ (55,057)	$ (3,614)	$ 15

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Mar. 31, 2015		45,122
Beginning Balance at Mar. 31, 2015	$ 430,771	$ 451	$ 539,565	$ (101,741)	$ (7,504)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	64,196		64,196
Tax benefits relating to share-based payments	3,265		3,265
Share issuances related to stock-based compensation (in shares)		1,575
Share issuances related to stock-based compensation	14,843	$ 15	14,828
Repurchase of common stock (in shares)		(2,563)
Repurchase of common stock	(91,477)	$ (26)	(18,855)	(72,596)
Net income (loss)	1,720			1,720
Other comprehensive loss	(1,705)				(1,705)
Ending Balance (in shares) at Mar. 31, 2016		44,134
Ending Balance at Mar. 31, 2016	421,613	$ 440	602,999	(172,617)	(9,209)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	73,928		73,928
Tax benefits relating to share-based payments	3,682		3,682
Share issuances related to stock-based compensation (in shares)		1,664
Share issuances related to stock-based compensation	21,321	$ 17	21,304
Repurchase of common stock (in shares)		(982)
Repurchase of common stock	(49,998)	$ (10)	(7,436)	(42,552)
Net income (loss)	(508)			(508)
Other comprehensive loss	(3,106)				(3,106)
Ending Balance (in shares) at Mar. 31, 2017		44,816
Ending Balance at Mar. 31, 2017	466,932	$ 447	694,477	(215,677)	(12,315)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASU 2016-09	164		435	(271)
Stock-based compensation	74,129		74,129
Share issuances related to stock-based compensation (in shares)		2,400
Share issuances related to stock-based compensation	30,114	$ 24	30,090
Repurchase of common stock (in shares)		(2,098)
Repurchase of common stock	(112,218)	$ (21)	(16,367)	(95,830)
Net income (loss)	(61,900)			(61,900)
Other comprehensive loss	6,843				6,843
Ending Balance (in shares) at Mar. 31, 2018		45,118
Ending Balance at Mar. 31, 2018	$ 404,064	$ 450	$ 782,764	$ (373,678)	$ (5,472)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income (loss)	$ (61,900)	$ (508)	$ 1,720
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	11,785	10,232	11,179
Noncash stock-based compensation	74,129	73,928	64,196
Excess tax benefits from stock-based compensation	0	(6,242)	(6,664)
Deferred income taxes	53,737	(11,468)	(8,805)
Equity in loss of affiliate	3,621	958	83
Amortization of deferred commissions cost	16,587	16,065	11,234
Changes in operating assets and liabilities:
Trade accounts receivable	(25,082)	(16,372)	1,760
Other current assets and Other assets	(6,876)	(55)	3,867
Deferred commissions cost	(17,984)	(18,393)	(12,868)
Accounts payable	618	(190)	(454)
Accrued liabilities	3,496	15,088	1,972
Deferred revenue	33,971	36,666	16,935
Other liabilities	(1,933)	330	258
Net cash provided by operating activities	84,169	100,039	84,413
Cash flows from investing activities
Purchase of short-term investments	(142,424)	(96,306)	(99,071)
Proceeds from maturity of short-term investments	131,480	74,685	49,935
Purchase of equity method investment	0	0	(4,662)
Purchases for corporate campus headquarters	0	0	(2,111)
Purchase of property and equipment	(7,047)	(6,424)	(6,280)
Net cash used in investing activities	(17,991)	(28,045)	(62,189)
Cash flows from financing activities
Repurchase of common stock	(112,218)	(49,998)	(91,477)
Proceeds from stock-based compensation plans	30,114	21,321	14,843
Excess tax benefits from stock-based compensation	0	6,242	6,664
Net cash used in financing activities	(82,104)	(22,435)	(69,970)
Effects of exchange rate — changes in cash	17,219	(8,175)	(1,820)
Net increase (decrease) in cash and cash equivalents	1,293	41,384	(49,566)
Cash and cash equivalents at beginning of year	329,491	288,107	337,673
Cash and cash equivalents at end of year	330,784	329,491	288,107
Supplemental disclosures of cash flow information
Interest paid	592	680	635
Income taxes paid, net	$ 6,448	$ 5,413	$ 1,989

Nature of Business	12 Months Ended
Nature of Business	Mar. 31, 2018
Accounting Policies [Abstract]
Nature of Business	Nature of Business Commvault Systems, Inc. and its subsidiaries (Commvault or the Company) is a provider of data and information management software applications and related services. The Company develops, markets and sells a suite of software applications and services, primarily in North America, Europe, Australia and Asia, that provides its customers with data protection solutions supporting all major operating systems, applications, and databases on virtual and physical servers, NAS shares, cloud-based infrastructures, and mobile devices; management through a single console; multiple protection methods including backup and archive, snapshot management, replication, and content indexing for eDiscovery; efficient storage management using deduplication for disk, tape and cloud; integration with the industry's top storage arrays; complete virtual infrastructure management supporting multiple hypervisors; security capabilities to limit access to critical data; policy based data management; and an end-user experience that allows them to protect, find and recover their own data using common tools such as web browsers, Microsoft Outlook and File Explorer. In fiscal 2018 the Company also started selling appliances that integrate the Company's software with hardware and address a wide-range of business needs and use cases, ranging from support for remote or branch offices with limited IT staff up to large corporate data centers. The Company also provides its customers with a broad range of professional and customer support services.

Summary of Significant Accounting Policies

12 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation

The consolidated financial statements include the accounts of the Company. All intercompany transactions and balances have been eliminated.

Use of Estimates

The preparation of financial statements and related disclosures in conformity with U.S. GAAP requires management to make judgments and estimates that affect the amounts reported in the Company’s consolidated financial statements and the accompanying notes. The Company bases its estimates and judgments on historical experience and on various other assumptions that it believes are reasonable under the circumstances. The amounts of assets and liabilities reported in the Company’s balance sheets and the amounts of revenues and expenses reported for each of its periods presented are affected by estimates and assumptions, which are used for, but not limited to, the accounting for revenue recognition, allowance for doubtful accounts, deferred commissions cost, income taxes and related reserves, stock-based compensation and accounting for research and development costs. Actual results could differ from those estimates.

Revenue

The Company accounts for revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers, which was adopted on April 1, 2017, using the full retrospective method. For further discussion of the Company's accounting policies related to revenue see Note 3.

Net Income per Common Share

Basic net income per common share is computed by dividing net income by the weighted average number of common shares during the period. Diluted net income per share is computed using the weighted average number of common shares and, if dilutive, potential common shares outstanding during the period. Potential common shares consist of the incremental common shares issuable upon the exercise of stock options, vesting of restricted stock units and shares to be purchased under the Employee Stock Purchase Plan. The dilutive effect of such potential common shares is reflected in diluted earnings per share by application of the treasury stock method.

The following table sets forth the computation of diluted net income per common share:



	Year Ended March 31,
	2018			2017			2016
Diluted net income (loss) per common share:
Basic weighted average shares outstanding	45,242			44,700			45,159
Dilutive effect of stock options, restricted stock units, and employee stock purchase plan	—			—			1,330
Diluted weighted average shares outstanding	45,242			44,700			46,489
Diluted net income per common share	$	(1.37	)	$	(0.01	)	$	0.04

The following table summarizes the potential outstanding common stock equivalents of the Company at the end of each period, which have been excluded from the computation of diluted net income per common share, as its effect is anti-dilutive.



	Year Ended March 31,
	2018	2017	2016
Stock options, restricted stock units, and shares under the employee stock purchase plan	7,312	8,106	4,183

Software Development Costs

Research and development expenditures are charged to operations as incurred. Based on the Company’s software development process, technological feasibility is established upon completion of a working model, which also requires certification and extensive testing. Costs incurred by the Company between completion of the working model and the point at which the product is ready for general release are immaterial.

Trade and Other Receivables

Trade and other receivables are primarily comprised of trade receivables that are recorded at the invoice amount, net of an allowance for doubtful accounts, which is not material. Unbilled receivables represent amounts for which revenue has been recognized but which have not yet been invoiced to the customer. The current portion of unbilled receivables is included in Trade accounts receivable on the consolidated balance sheet. Long term unbilled receivables are included in Other assets.

Accounting for Income Taxes

The Company accounts for income taxes in accordance with ASC Topic 740, “Income Taxes” (ASC 740). The provision for income taxes and effective tax rates are calculated by legal entity and jurisdiction and are based on a number of factors, including the level of pre-tax earnings, income tax planning strategies, differences between tax laws and accounting rules, statutory tax rates and credits, uncertain tax positions and valuation allowances. The Company uses significant judgment and estimates in evaluating tax positions. The effective tax rate in a given financial statement period may be materially impacted by changes in the mix and level of earnings by taxing jurisdiction.

Under ASC 740, deferred income taxes arise from temporary differences between the tax basis of assets and liabilities and their reported amounts. Valuation allowances are established when, in the Company's judgment, it is more likely than not that deferred tax assets will not be realized. In assessing the need for a valuation allowance, the Company weighs the available positive and negative evidence, including historical levels of pre-tax income, legislative developments, expectations and risks associated with estimates of future pre-tax income, and prudent and feasible tax planning strategies.

Cash and Cash Equivalents

The Company considers all highly liquid investments purchased with maturities of three months or less at the date of purchase to be cash equivalents. As of March 31, 2018, the Company’s cash and cash equivalents balance consisted primarily of money market funds.

Short-term Investments

Short-term investments consist of investments with maturities of twelve months or less that do not meet the criteria to be cash equivalents. The company determines classification of the investment as trading, available-for-sale or held-to-maturity at the time of purchase and reevaluates classification whenever changes in circumstances indicate changes in classification may be necessary. The Company’s current short-term investments are classified as held-to-maturity. Held-to-maturity investments consist of securities that the Company has the intent and ability to retain until maturity. Held-to-maturity investments are initially recorded at cost and adjusted for the amortization of discounts from the date of purchase through maturity. Income related to investments is recorded as interest income in the Consolidated Statement of Operations. Cash inflows and outflows related to the sale, maturity and purchase of investments are classified as investing activities in the Company’s Consolidated Statements of Cash Flows.

Concentration of Credit Risk

The Company grants credit to customers in a wide variety of industries worldwide and generally does not require collateral. Credit losses relating to these customers have been minimal.

Sales through the Company’s distribution agreement with Arrow Enterprise Computing Solutions, Inc. (Arrow) totaled approximately 36%, 36% and 38% of total revenues for the years ended March 31, 2018, 2017 and 2016, respectively. Arrow accounted for approximately 38% and 40% of total accounts receivable as of March 31, 2018 and 2017, respectively.

Fair Value of Financial Instruments

The carrying amounts of the Company’s cash and cash equivalents, accounts receivable and accounts payable approximate their fair values due to the short-term maturity of these instruments. As of March 31, 2018 and 2017, the Company’s short-term investments balance consisted of U.S. Treasury Bills.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for such asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value should maximize the use of observable inputs and minimize the use of unobservable inputs. To measure fair value, the Company uses the following fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable:

Level 1 — Quoted prices in active markets for identical assets or liabilities.

Level 2 — Inputs other than Level 1 that are observable for the asset or liability, either directly or indirectly, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data by correlation or other means.

Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The following table summarizes the composition of the Company’s financial assets measured at fair value on a recurring basis at March 31, 2018 and March 31, 2017:



March 31, 2018	Level 1		Level 2		Level 3	Total
Cash equivalents	$	43,545	—		—	$	43,545
Short-term investments	—		$	132,263	—	$	132,263



March 31, 2017	Level 1		Level 2		Level 3	Total
Cash equivalents	$	70,190	—		—	$	70,190
Short-term investments	—		$	120,989	—	$	120,989

Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation and amortization. Land is not depreciated. The Company provides for depreciation on a straight-line basis over the estimated useful lives of the assets. The depreciable assets that comprise the Company's owned headquarters classified as Buildings are being depreciated over lives ranging from ten to sixty years. Computer and related equipment is generally depreciated over eighteen months to three years and furniture and fixtures are generally depreciated over three to twelve years. Leasehold improvements are amortized over the shorter of the useful life of the improvement or the term of the related lease. Expenditures for routine maintenance and repairs are charged against operations. Major replacements, improvements and additions are capitalized.

Asset Retirement Obligation

A liability for the fair value of an asset retirement obligation and corresponding increase to the carrying value of the related leasehold improvements are recorded at the time leasehold improvements are acquired. The Company maintains certain office space for which the lease agreement requires that the Company return the office space to its original condition upon vacating the premises. Accordingly, the balance of the asset retirement obligation was $1,303 as of March 31, 2018 and $1,204 as of March 31, 2017.

Long-Lived Assets

The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be fully recoverable. To determine the recoverability of its long-lived assets, the Company evaluates the estimated future undiscounted cash flows that are directly associated with, and that are expected to arise as a direct result of, the use and eventual disposition of the long-lived asset. If the estimated future undiscounted cash flows demonstrate that recoverability is not probable, an impairment loss would be recognized. An impairment loss would be calculated based on the excess carrying amount of the long-lived asset over the long-lived asset’s fair value. The fair value would be determined based on valuation techniques such as a comparison to fair values of similar assets. There were no impairment charges recognized during the years ended March 31, 2018, 2017 and 2016.

Equity Method Investment

In fiscal 2016, the Company acquired a 34% ownership in Laitek, Inc. (Laitek). Laitek develops solutions for acquiring, processing and presenting scientific and medical image information. The Company uses the equity method to account for its investment. In the event that management identifies an other than temporary decline in the estimated fair value of an equity method investment to an amount below its carrying value, such investment is written down to its estimated fair value. The Company also has development and original equipment manufacturing agreements with Laitek to jointly develop healthcare related software products. During fiscal 2018, the Company identified an indicator of impairment related to its investment and impaired the value of the investment to zero, which approximated the estimated fair value. This fair value measurement was based on unobservable inputs (Level 3).

Deferred Commissions Cost

Sales commissions and related payroll taxes earned by the Company's employees are considered incremental and recoverable costs of obtaining a contract with a customer. The Company’s typical contracts include performance obligations related to software licenses, software updates, customer support and other professional services. In these contracts, incremental costs of obtaining a contract are allocated to the performance obligations based on the relative estimated standalone selling prices and then recognized on a systematic basis that is consistent with the transfer of the goods or services to which the asset relates. The Company does not pay commissions on annual renewals of contracts for software updates and customer support for perpetual licenses. The costs allocated to software and products are expensed at the time of sale, when revenue for the functional software license or appliance is recognized. The costs allocated to software updates and customer support for perpetual licenses are amortized ratably over a period of approximately five years, the expected period of benefit of the asset capitalized. The Company currently estimates a period of five years is appropriate based on consideration of historical average customer life and the estimated useful life of the underlying software or appliance sold as part of the transaction. The costs related to professional services are amortized within one quarter following the date of the related software or appliance sale, which is typically the period the related professional services are provided and revenue is recognized. Amortization expense related to these costs is included in Sales and marketing expenses in the accompanying condensed consolidated statements of loss.

Costs related to software updates and support for term-based, or subscription software licenses, are limited to the contractual period of the arrangement as the Company intends to pay a commensurate commission upon renewal of the subscription license and related updates and support.

Deferred Revenue

Deferred revenues represent amounts collected from, or invoiced to, customers in excess of revenues recognized. This results primarily from the billing of annual customer support agreements, and billings for other professional services fees that have not yet been performed by the Company. The value of deferred revenues will increase or decrease based on the timing of invoices and recognition of revenue.

Related Party Transactions

During the first quarter of fiscal 2018, one of our Directors, Joseph F. Eazor, was hired as the CEO of Rackspace, Inc (Rackspace). Rackspace has been a customer of the Company since 2006. Total recognized revenue related to Rackspace in fiscal 2018 was $10,024. This total includes the renewal of a subscription software license in March 2018 for $4,756. The outstanding accounts receivable from this customer as of March 31, 2018 is $5,704.

Accounting for Stock-Based Compensation

The Company utilizes the Black-Scholes pricing model to determine the fair value of non-qualified stock options on the dates of grant. Restricted stock units without a market condition are measured based on the fair market values of the underlying stock on the date of grant. The Company recognizes stock-based compensation using the straight-line method for all stock awards that don't include a market or performance condition.

Share Repurchases

The Company considers all shares repurchased as canceled shares restored to the status of authorized but unissued shares on the trade date. The aggregate purchase price of the shares of the Company’s common stock repurchased is reflected as a reduction to Stockholders’ Equity. The Company accounts for shares repurchased as an adjustment to common stock (at par value) with the excess repurchase price allocated between Additional Paid-in Capital and Accumulated Deficit.

Sales Tax

The Company records revenue net of sales tax.

Advertising Costs

The Company expenses advertising costs as incurred. Advertising expenses were $5,704, $7,816, and $5,083 for the years ended March 31, 2018, 2017 and 2016, respectively.

Shipping and Handling Costs

Shipping and handling costs are included in cost of revenues for all periods presented.

Foreign Currency Translation

The functional currencies of the Company’s foreign operations are deemed to be the local country’s currency. Assets and liabilities of the Company’s international subsidiaries are translated at their respective period-end exchange rates, and revenues and expenses are translated at average currency exchange rates for the period. The resulting balance sheet translation adjustments are included in Other Comprehensive Loss and are reflected as a separate component of Stockholders’ Equity.

Foreign currency transaction gains and losses are recorded in “General and administrative expenses” in the Consolidated Statements of Operations. The Company recognized net foreign currency transaction gains of $109, $644 and $195 in the years ended March 31, 2018, 2016, and 2015, respectively. The net foreign currency transaction gains recorded in “General and administrative expenses” include settlement gains and losses on forward contracts disclosed below.

Comprehensive Income (Loss)

Comprehensive income (loss) is defined to include all changes in equity, except those resulting from investments by stockholders and distribution to stockholders.

Recently Issued Accounting Standards

Revenue Recognition

As of April 1, 2017 the Company early adopted Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606), and the amendments in ASUs 2015-14, 2016-08, 2016-10 and 2016-12. This standard replaced existing revenue recognition rules with a comprehensive revenue measurement and recognition standard and expanded disclosure requirements. The ASU also includes guidance regarding the accounting for contract acquisition costs, which includes sales commissions. The Company has early adopted the new standard as of April 1, 2017 using the full retrospective method which required each prior reporting period presented to be adjusted beginning with this issuance of the Company’s financial statements. The most significant impact of adopting the new standard related to the deferral of commission costs. A portion of sales commissions cost is now recorded as an asset and recognized as an operating expense over the time period that the Company expects to recover the costs.

Select adjusted unaudited financial statement information, which reflect the adoption of Topic 606 is below. The Company’s historical net cash flows are not impacted by this accounting change.



	Year Ended March 31, 2016
	As Reported			Adjustments			Recast for Adoption of ASC 606
Revenues:
Software and products	$	258,793		$	(702	)	$	258,091
Services	336,333			(657		)	335,676
Total revenues	595,126			(1,359		)	593,767
Total cost of revenues	82,712			—			82,712
Gross margin	512,414			(1,359		)	511,055
Total operating expenses	510,415			(3,470		)	506,945
Income from operations	1,999			2,111			4,110
Interest expense	(933		)	—			(933		)
Interest income	862			—			862
Equity in loss of affiliate	(83		)	—			(83		)
Income before income taxes	1,845			2,111			3,956
Income tax expense	1,709			527			2,236
Net income	$	136		$	1,584		$	1,720



	Year Ended March 31, 2017
	As Reported			Adjustments			Recast for Adoption of ASC 606
Revenues:
Software and products	$	296,421		$	(5,753	)	$	290,668
Services	354,097			240			354,337
Total revenues	650,518			(5,513		)	645,005
Total cost of revenues	85,192			—			85,192
Gross margin	565,326			(5,513		)	559,813
Total operating expenses	565,097			(4,042		)	561,055
Income (loss) from operations	229			(1,471		)	(1,242		)
Interest expense	(957		)	—			(957		)
Interest income	1,163			—			1,163
Equity in loss of affiliate	(958		)	—			(958		)
Loss before income taxes	(523		)	(1,471		)	(1,994		)
Income tax benefit	(1,063		)	(423		)	(1,486		)
Net income (loss)	$	540		$	(1,048	)	$	(508	)



	March 31, 2017
	Balance Sheet Data
	As Reported			Adjustments			Recast for Adoption of ASC 606
Current assets:
Trade accounts receivable	$	132,761		$	7,323		$	140,084
Total current assets	$	598,736		$	7,323		$	606,059
Deferred tax assets, net	$	61,018		$	(10,790	)	$	50,228
Deferred commissions	$	—		$	30,378		$	30,378
Total assets	$	802,967		$	26,911		$	829,878
Current Liabilities:
Deferred revenue	$	206,777		$	2,322		$	209,099
Total current liabilities	$	285,595		$	2,322		$	287,917
Other liabilities	$	3,934		$	292		$	4,226
Accumulated deficit	$	(239,974	)	$	24,297		$	(215,677	)
Total stockholders’ equity	$	442,635		$	24,297		$	466,932
Total liabilities and stockholders’ equity	$	802,967		$	26,911		$	829,878



	Year Ended March 31, 2016
	As Reported			Adjustments			Recast for Adoption of ASC 606
Cash flows from operating activities
Net income	$	136		$	1,584		$	1,720
Deferred income taxes	$	(9,332	)	$	527		$	(8,805	)
Amortization of deferred commissions cost	$	—		$	11,234		$	11,234
Changes in operating assets and liabilities:
Trade accounts receivable	$	3,879		$	(2,119	)	$	1,760
Other current assets and Other assets	$	2,843		$	1,024		$	3,867
Deferred commissions cost	$	—		$	(12,868	)	$	(12,868	)
Deferred revenue	$	16,317		$	618		$	16,935



	Year Ended March 31, 2017
	As Reported			Adjustments			Recast for Adoption of ASC 606
Cash flows from operating activities
Net income (loss)	$	540		$	(1,048	)	$	(508	)
Deferred income taxes	$	(11,045	)	$	(423	)	$	(11,468	)
Amortization of deferred commissions cost	$	—		$	16,065		$	16,065
Changes in operating assets and liabilities:
Trade accounts receivable	$	(21,493	)	$	5,121		$	(16,372	)
Deferred commissions cost	$	—		$	(18,393	)	$	(18,393	)
Deferred revenue	$	37,988		$	(1,322	)	$	36,666

Stock-based Compensation

In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718), which simplifies the accounting for share-based payment transactions, including related accounting for income taxes, forfeitures, and classification in the statement of cash flows. The Company adopted the guidance prospectively effective April 1, 2017.

The guidance requires excess tax benefits and tax deficiencies to be recorded as income tax benefit or expense in the statement of income when the awards vest or are settled, and eliminates the requirement to reclassify cash flows related to excess tax benefits from operating activities to financing activities on the statement of cash flows. Amounts previously recorded to Additional paid-in capital related to excess tax benefits prior to April 1, 2017 remain in Stockholders' equity. Cash flows related to excess taxes prior to April 1, 2017 remain classified as financing cash flows. In addition, the standard allows the Company to repurchase more of an employee’s vesting shares for tax withholding purposes without triggering liability accounting, and provides an accounting policy election to account for forfeitures as they occur. The Company has elected to account for forfeitures as they occur. The cumulative impact of the election to account for forfeitures as they are incurred is included as an adjustment to accumulated deficit.

Leases

In February 2016, the FASB issued ASU 2016-02 “Leases (Topic 842)” (ASU 2016-02). Under ASU 2016-02, a lessee will recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-to-use asset representing its right to use the underlying asset for the lease term. The amendments of this ASU are effective for the Company's fiscal 2020, with early adoption permitted. The Company is currently assessing the impact the adoption of ASU 2016-02 will have on the financial statements.

There have been no other accounting pronouncements issued but not yet adopted by the Company which are expected to have a material impact on the Company’s financial position, results of operations or cash flows.

Revenue

12 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue

The Company accounts for revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers, which was adopted on April 1, 2017, using the full retrospective method.

The Company derives revenues from two primary sources: software and products, and services. Software and products revenue includes the Company's software and integrated appliances that combine the Company's software with hardware. Services include customer support (software updates and technical support), consulting, assessment and design services, installation services and customer education. A typical contract includes both licenses and services.

The Company’s software licenses typically provide for a perpetual right to use the Company’s software. The Company also sells term-based software licenses that expire, which are referred to as subscription arrangements. The Company does not customize its software and installation services are not required. The software is delivered before related services are provided and is functional without professional services, updates and technical support. The Company has concluded that its software license is functional intellectual property that is distinct as the user can benefit from the software on its own. Software revenue is typically recognized when the software is delivered and/or made available for download as this is the point the user of the software can direct the use of, and obtain substantially all of the remaining benefits from the functional intellectual property. The Company does not recognize software revenue related to the renewal of subscription software licenses earlier than the beginning of the subscription period.

In fiscal 2018, the Company also started selling appliances that integrate the Company's software with hardware and address a wide-range of business needs and use cases, ranging from support for remote or branch offices with limited IT staff up to large corporate data centers. Revenue related to appliances is recognized when control of the appliances passes to the customer; typically upon delivery. Revenue to date related to appliances has not been significant.

Services revenue includes revenue from customer support and other professional services. Customer support includes software updates on a when-and-if-available basis, telephone support, integrated web-based support and bug fixes or patches. The Company sells its customer support contracts as a percentage of net software purchases the support is related to. Customer support revenue is recognized ratably over the term of the customer support agreement, which is typically one year.

The Company’s other professional services include consulting, assessment and design services, installation services and customer education. Customer education services include courses taught by the Company’s instructors or third-party contractors. Revenue related to other professional services and customer education services is typically recognized as the services are performed.

Most of the Company’s contracts with customers contain multiple performance obligations. For these contracts, the Company accounts for individual performance obligations separately if they are distinct. The transaction price is allocated to the separate performance obligations on a relative standalone selling price basis. Standalone selling prices of software and appliances are typically estimated using the residual approach. Standalone selling prices of services are typically estimated based on observable transactions when these services are sold on a standalone basis.

The Company’s typical performance obligations include the following:



Performance Obligation	When Performance Obligation is Typically Satisfied	When Payment is Typically Due	How Standalone Selling Price is Typically Estimated
Software and Products Revenue
Software Licenses	Upon shipment or made available for download (point in time)	Within 90 days of shipment except for certain subscription licenses which are paid for over time	Residual approach
Appliances	When control of the appliances passes to the customer; typically upon delivery	Within 90 days of delivery except for certain subscriptions which are paid for over time	Residual approach
Customer Support Revenue
Software Updates	Ratably over the course of the support contract (over time)	At the beginning of the contract period	Observable in renewal transactions
Customer Support	Ratably over the course of the support contract (over time)	At the beginning of the contract period	Observable in renewal transactions
Professional Services
Other Professional Services (except for education services)	As work is performed (over time)	Within 90 days of services being performed	Observable in transactions without multiple performance obligations
Education Services	When the class is taught (point in time)	Within 90 days of services being performed	Observable in transactions without multiple performance obligations

Disaggregation of Revenue

The Company disaggregates revenue from contracts with customers into the nature of the products and services and geographical regions. The geographic regions that are tracked are the Americas (United States, Canada, Latin America), EMEA (Europe, Middle East, Africa) and APAC (Australia, New Zealand, Southeast Asia, China). The Company operates in one segment.



	Year Ended March 31, 2018
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	167,858	$	100,452	$	43,435	$	311,745
Customer Support Revenue	233,991		75,807		36,257		346,055
Professional Services	23,453		11,289		6,851		41,593
Total Revenue	$	425,302	$	187,548	$	86,543	$	699,393



	Year Ended March 31, 2017
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	168,243	$	82,393	$	40,032	$	290,668
Customer Support Revenue	216,656		65,732		32,466		314,854
Professional Services	22,704		11,364		5,415		39,483
Total Revenue	$	407,603	$	159,489	$	77,913	$	645,005



	Year Ended March 31, 2016
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	153,281	$	75,389	$	29,421	$	258,091
Customer Support Revenue	204,223		61,052		29,039		294,314
Professional Services	24,391		11,195		5,776		41,362
Total Revenue	$	381,895	$	147,636	$	64,236	$	593,767

Information about Contract Balances

Amounts collected in advance of services being provided are accounted for as deferred revenue. Nearly all of the Company's deferred revenue balance is related to services revenue, primarily customer support contracts.

In some arrangements the Company allows customers to pay for term based software licenses and products over the term of the software license. Amounts recognized as revenue in excess of amounts billed are recorded as unbilled receivables. Unbilled receivables which are anticipated to be invoiced in the next twelve months are included in Accounts receivable on the consolidated balance sheet. Long term unbilled receivables are included in Other assets. The opening and closing balances of the Company’s accounts receivable, unbilled receivables, and deferred revenues are as follows:



	Accounts Receivable		Unbilled Receivable (current)		Unbilled Receivable (long-term)		Deferred Revenue (current)		Deferred Revenue (long-term)
Opening Balance as of March 31, 2017	$	132,711	$	7,373	$	—	$	209,099	$	70,803
Increase, net	19,508		2,527		4,380		32,014		13,858
Ending Balance as of March 31, 2018	$	152,219	$	9,900	$	4,380	$	241,113	$	84,661

The increase in accounts receivable is primarily a result of an increase in software and products revenue relative to the prior year and an increase in subscription software transactions that are recognized as revenue at the time of sale but paid for over time. The increase in deferred revenue is primarily the result of an increase in deferred customer support revenue related to software and products revenue transactions and customer support renewals during fiscal 2018, most of which will be recognized over the course of the next twelve months.

The amount of revenue recognized in the period that was included in the opening deferred revenue balance was $209,099 for the year ended March 31, 2018. The vast majority of this revenue consists of customer support arrangements. The amount of revenue recognized from performance obligations satisfied in prior periods was not material.

Remaining Performance Obligations

In addition to the amounts included in deferred revenue as of March 31, 2018, approximately $20,821 of revenue may be recognized from remaining performance obligations, of which $320 was related to software and products. The Company expects the software and products revenue to be recognized next quarter. The majority of the services revenue is related to other professional services which may be recognized over the next twelve months but is contingent upon a number of factors, including customers’ needs and schedules.

Property and Equipment

12 Months Ended

Mar. 31, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment consist of the following:



	March 31,
	2018			2017
Land	$	9,445		$	9,445
Buildings	103,244			103,244
Computers, servers and other equipment	37,132			35,274
Furniture and fixtures	15,594			14,912
Leasehold improvements	10,143			7,040
Purchased software	1,425			1,335
Construction in process	57			1,147
	177,040			172,397
Less: Accumulated depreciation and amortization	(48,428		)	(40,078		)
	$	128,612		$	132,319

The Company recorded depreciation and amortization expense of $11,217, $9,980, and $10,927 for the years ended March 31, 2018, 2017 and 2016, respectively.

Accrued Liabilities

12 Months Ended

Mar. 31, 2018

Payables and Accruals [Abstract]

Accrued Liabilities

Accrued liabilities consist of the following:



	March 31,
	2018		2017
Compensation and related payroll taxes	$	46,192	$	45,149
Other	36,107		33,552
	$	82,299	$	78,701

Commitments and Contingencies

12 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Leases

The Company leases various office facilities under non-cancelable leases, which expire on various dates through April 2022. Future minimum lease payments under all operating leases at March 31, 2018 are as follows:



Year Ending March 31,
2019	$	9,858
2020	8,316
2021	6,558
2022	4,449
2023 and thereafter	3,746
	$	32,927

Rent expenses were $12,215, $10,377, and $9,856 for the years ended March 31, 2018, 2017 and 2016, respectively.

Rent expense is calculated by amortizing total rental payments (net of any rental abatements, allowances and other rental concessions), on a straight-line basis, over the lease term. Accordingly, rent expense charged to operations differs from rent paid resulting in the Company recording deferred rent.

Purchase Commitments

The Company, in the normal course of business, enters into various purchase commitments for goods or services. Total non-cancellable purchase commitments as of March 31, 2018 are approximately $20,164 for fiscal 2019, $5,841 for fiscal 2020, $1,025 for fiscal 2021 and $299 for fiscal 2022, totaling $27,329 for all periods through fiscal 2022. These purchase commitments relate primarily to marketing and IT services.

The Company has certain software royalty commitments associated with the shipment and licensing of certain products. Royalty expense is generally based on a fixed cost per unit shipped or a fixed fee for unlimited units shipped over a designated period. Royalty expense, included in cost of software and products revenues, was $4,462 in fiscal 2018, $2,646 in fiscal 2017 and $1,933 in fiscal 2016.

Warranties and Indemnifications

The Company offers a 90-day limited product warranty for its software. To date, costs related to this product warranty have not been material.

The Company provides certain provisions within its software licensing agreements to indemnify its customers from any claim, suit or proceeding arising from alleged or actual intellectual property infringement. These provisions continue in perpetuity, along with the Company’s software licensing agreements. The Company has never incurred a liability relating to one of these indemnification provisions, and management believes that the likelihood of any future payout relating to these provisions is remote. Therefore, the Company has not recorded a liability during any period for these indemnification provisions.

Legal Proceedings

On September 10, 2014, a purported class action complaint was filed in the United States District Court for the District of New Jersey against the Company, its Chief Executive Officer and its Chief Financial Officer. The case is captioned In re Commvault Systems, Inc. Securities Litigation (Master File No. 3:14-cv-05628-MAS-LHG). The suit alleges that the Company made materially false and misleading statements, or failed to disclose material facts, regarding the Company's financial results, business, operations and prospects in violation of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder. The suit is purportedly brought on behalf of purchasers of the Company's common stock during the period from May 7, 2013 through April 24, 2014, and seeks compensatory damages, costs and expenses, as well as equitable or other relief. Lead plaintiff, the Arkansas Teachers Retirement System, was appointed on January 12, 2015, and on March 18, 2015, an amended complaint was filed by the plaintiffs. On December 17, 2015, the defendant’s motion to dismiss the case was granted and the case dismissed; however, the plaintiffs were permitted to re-file their claim, which they did on February 5, 2016. Defendants filed another motion to dismiss on April 5, 2016, which was denied by the court on September 30, 2016. Thereafter, discovery commenced. On October 2, 2017, the parties entered into an agreement in principle to settle the action for $12,500. The parties signed a stipulation of settlement on November 30, 2017. The settlement remains subject to court approval; the court has scheduled a hearing for May 14, 2018 to consider whether to approve the settlement. The settlement amount has been funded solely by the Company’s insurers. There can be no assurance that the settlement will ultimately be approved or that it will become final. If the settlement does not occur and litigation against the Company continues, the Company believes that it has meritorious defenses and intends to defend the case vigorously. However, due to the inherent uncertainties of litigation, the Company cannot accurately predict the ultimate outcome of this matter if the litigation continues.

On April 12, 2017, a shareholder derivative complaint was filed in the United States District Court for the District of New Jersey against the Company (nominally), certain of its executive officers and certain members of the board of directors. The complaint is entitled Murashko v. Hammer, et al. (Civ. No. 3:17-cv-02533-PGS-TJB). The plaintiff filed an amended complaint on July 14, 2017. The amended complaint largely repeats the allegations made in the securities litigation also pending in the United States District Court for the District of New Jersey (In re Commvault Systems, Inc. Securities Litigation (Master File No. 3:14-cv-05628-PGS-LHG), claiming that the defendant officers and directors breached their fiduciary duties to the Company by causing, or allowing, the Company to manipulate its financial results and conceal the state of its business prospects. The suit also alleges that certain executive officers engaged in unlawful insider trading in 2013 and/or 2014 based on their knowledge of the information that was supposedly concealed. The allegations asserted in the shareholder derivative action purport to cover a period from 2013 through the present. As a derivative action, the complaint does not seek damages from the Company, but rather seeks to recover from the defendant officers and directors on behalf of the Company compensatory damages, restitution, costs and expenses, as well as equitable or other relief. On August 29, 2017, all of the defendants, including the Company, filed a motion to dismiss the derivative action; that motion was granted on February 22, 2018. The court dismissed the complaint without prejudice for failure to make a demand on the Company’s Board of Directors or to plead facts showing that a demand would be futile. The plaintiff chose not to appeal the dismissal of his complaint. On November 30, 2017, a virtually identical shareholder derivative complaint was filed in state court in New Jersey entitled Lee v. Hammer, et al., Civ. 201-17 (N.J. Super. Ct.). On April 27, 2018, the parties agreed to dismiss the complaint without prejudice. While both derivative cases have been dismissed without prejudice, due to the inherent uncertainties of litigation, these cases or similar cases may be brought again in the future and the Company cannot accurately predict the ultimate outcome of these matters should they be re-filed.

On February 27, 2017, Realtime Data LLC d/b/a/ IXO (Realtime), a non-practicing entity, sued the Company and Spectra Logic Corporation in the Eastern District of Texas for alleged infringement of four patents: U.S. Patent Nos. 9,054,728, 7,415,530, 9,116,908, and 8,717,204. Realtime dismissed the case in Texas and refiled this case in the District of Delaware on July 10, 2017. Realtime has sued numerous other companies for infringement of these and other patents. Realtime seeks monetary damages and an injunction. The Company responded to the complaint by filing a motion to dismiss on the grounds that the patents are directed to patent-ineligible subject matter. The Court has not yet ruled on this motion. Due to the inherent uncertainties of litigation, the Company cannot accurately predict the ultimate outcome of this matter. The Company is unable at this time to determine whether the outcome of the litigation will have a material impact on its results of operations, financial condition or cash flows. The Company intends to defend itself vigorously. As of March 31, 2018, the Company has not recorded an accrual for this matter as it has concluded that the probability of loss is remote.

Revolving Credit Facility	12 Months Ended
Revolving Credit Facility	Mar. 31, 2018
Debt Disclosure [Abstract]
Revolving Credit Facility	Revolving Credit Facility The Company had a five-year $250,000 revolving credit facility (the “Credit Facility”) that it terminated on February 9, 2018. Outstanding borrowings under the Credit Facility accrued interest at an annual rate equal to London Interbank Offered Rate plus 1.50% subject to increases based on the Company's actual leverage. The unused balance on the Credit Facility was also subject to a 0.25% annual interest charge subject to increases based on the Company's actual leverage. The Company had deferred the expense related to debt issuance costs, which were classified as Other Assets, and were being amortized into interest expense. The amortization of debt issuance costs was $568 for year ended March 31, 2018 (inclusive of costs written off upon termination) and $252 for the year ended March 31, 2017.

Capitalization	12 Months Ended
Capitalization	Mar. 31, 2018
Equity [Abstract]
Capitalization	Capitalization On November 13, 2008, the Board of Directors of the Company adopted a Rights Plan and declared a dividend distribution of one Right for each outstanding share of common stock to shareholders of record on November 24, 2008. Each Right, when exercisable, entitles the registered holder to purchase one one-thousandth of a share of Series A Junior Participating Preferred Stock, par value $0.01 per share, at a purchase price of eighty dollars per one one thousandth of a share, subject to adjustment. Of the 50,000 shares of preferred stock authorized under the Company’s certificate of incorporation, 150 have been designated as Series A Junior Participating Preferred. The Rights will become exercisable following the tenth business day after (i) a person or group announces the acquisition of 15% or more of the Company’s common stock or (ii) commencement of a tender or exchange offer, the consummation of which would result in ownership by the person or group of 15% or more of the Company’s common stock. The Company is also entitled to redeem the Rights at $0.001 per right under certain circumstances. The Rights expire on November 14, 2018, if not exercised or redeemed. Common Stock The Company had 45,118 and 44,816 shares of common stock, par value $0.01, outstanding at March 31, 2018 and March 31, 2017, respectively. During fiscal 2018, the Company repurchased $112,218 of common stock, or 2,098 shares, under its share repurchase program. As of March 31, 2018, $112,840 remained in the current stock repurchase authorization which expires on March 31, 2019. Shares Reserved for Issuance At March 31, 2018 the Company has reserved 3,908 shares in connection with its Stock Plans discussed in Note 9.

Stock Plans

12 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Plans

As of March 31, 2018, the Company maintains one stock incentive plan for purposes of granting awards, the Omnibus Incentive Plan as amended by amendment one (the “2016 Incentive Plan”). The Company has one additional plan, the 2006 Long-Term Stock Incentive Plan (the “LTIP”), with outstanding options and awards but cannot be used for future grants.

The 2016 Incentive Plan permits the grant of incentive stock options, non-qualified stock options, restricted stock awards, restricted stock units, stock appreciation rights, performance stock awards and stock unit awards based on, or related to, shares of the Company’s common stock. As of March 31, 2018, approximately 1,742 shares were available for future issuance under the 2016 Incentive Plan.

As of March 31, 2018, the Company has granted non-qualified stock options, restricted stock units and performance stock awards under its stock incentive plans. Historically, equity awards granted by the Company under its stock incentive plans generally vest quarterly over a four-year period, except that the shares that would otherwise vest quarterly over the first twelve months do not vest until the first anniversary of the grant. Beginning in October of 2015, the Company began granting its equity awards with a three-year vest period, and retained the practice that shares that would otherwise vest quarterly over the first twelve months do not vest until the first anniversary of the grant. However, from time to time the company grants equity awards that vest between one and three years. The Company anticipates that future grants under its stock incentive plans will be restricted stock units and performance stock awards and does not anticipate that it will grant stock options.

As of March 31, 2018, there was approximately $87,814 of unrecognized stock-based compensation expense related to all of the Company's employee stock plans, net of estimated forfeitures, that is expected to be recognized over a weighted average period of 1.01 years. To the extent the actual forfeiture rate is different from what the Company has anticipated, stock-based compensation related to these awards will be different from the Company’s expectations.

The Company estimated the fair value of stock options granted using the Black-Scholes formula. The Company’s calculation of expected term includes a combination of actual exercise data and an assumption on when the remaining outstanding options with similar characteristics would be exercised based on the Company’s historical data. In determining expected life, the Company separates employees into groups that have historically exhibited similar behavior with regard to option exercises. Expected volatility is calculated based on a blended approach that included the implied volatility of the Company’s traded options with a remaining maturity greater than six months and the historical realized volatility of the Company’s common stock. The risk-free interest rate is determined by reference to U.S. Treasury yield curve rates with a remaining term that is approximately the expected life assumed at the date of grant. Forfeitures are estimated based on the Company’s historical analysis of actual stock option forfeitures.

The assumptions used in the Black-Scholes option-pricing model are as follows:



		Year Ended March 31,
		2016
Dividend yield		None
Expected volatility		39% - 43%
Weighted average expected volatility		41%
Risk-free interest rates		1.29% - 1.75%
Weighted average expected life (in years)		4.6

The following summarizes the activity for the Company’s stock incentive plans from March 31, 2015 to March 31, 2018:



Options	Number of Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding at March 31, 2015	6,853		$	40.91
Options granted	148		41.84
Options exercised	(764	)	8.80
Options forfeited	(172	)	59.79
Options expired	(126	)	61.81
Outstanding at March 31, 2016	5,939		44.07
Options granted	—		—
Options exercised	(446	)	28.44
Options forfeited	(77	)	51.55
Options expired	(116	)	68.98
Outstanding at March 31, 2017	5,300		44.74
Options granted	—		—
Options exercised	(842	)	23.57
Options forfeited	(26	)	43.30
Options expired	(30	)	68.27
Outstanding at March 31, 2018	4,402		$	48.64	4.16	$	65,223
Exercisable at March 31, 2018	4,210		$	48.81	4.05	$	62,888

The weighted average fair value of stock options granted was $15.20 per share during the year ended March 31, 2016. The total intrinsic value of options exercised was $26,547, $9,896, and $23,391 in the years ended March 31, 2018, 2017 and 2016, respectively. The Company’s policy is to issue new shares upon exercise of options as the Company does not hold shares in treasury.

Restricted stock unit activity is as follows:



Non-Vested Restricted Stock Units	Number of Awards		Weighted Average Grant Date Fair Value
Non-vested as of March 31, 2015	1,412		$	56.82
Granted	1,543		37.27
Vested	(547	)	38.38
Forfeited	(196	)	49.24
Non-vested as of March 31, 2016	2,212		43.43
Granted	1,333		50.66
Vested	(975	)	51.35
Forfeited	(174	)	43.56
Non-vested as of March 31, 2017	2,396		45.53
Granted	1,235		59.71
Vested	(1,324	)	46.74
Forfeited	(141	)	48.24
Non-vested as of March 31, 2018	2,166		$	54.13

The total fair value of the restricted stock units that vested during the years ended March 31, 2018, 2017 and 2016 was $76,193, $50,051 and $20,981, respectively.

The following table presents the stock-based compensation expense included in cost of services revenue, sales and marketing, research and development and general and administrative expenses for the years ended March 31, 2018, 2017 and 2016.



	Year Ended March 31,
	2018		2017		2016
Cost of services revenue	$	3,182	$	3,925	$	3,106
Sales and marketing	36,917		34,005		28,557
Research and development	8,411		7,335		6,722
General and administrative	25,619		28,663		25,811
Stock-based compensation expense	$	74,129	$	73,928	$	64,196

Performance Based Awards

In fiscal 2018, the Company granted 107 performance restricted stock units (PSU) to certain executives. Vesting of these awards is contingent upon i) the Company meeting certain company-wide revenue and non-GAAP performance goals (performance-based) in fiscal 2018 and ii) the Company's customary service periods. The awards vest in three annual tranches and have a maximum potential to vest at 200% (214 shares) based on actual fiscal 2018 performance. The related stock-based compensation expense is determined based on the value of the underlying shares on the date of grant and is recognized over the vesting term using the accelerated method. During each financial period, management estimates the probable number of PSUs that would vest until the ultimate achievement of the performance goals is known. Based on the Company's results, the PSUs granted in fiscal 2018 will be eligible to vest at 54%. The awards are included in the restricted stock units table.

Awards with a Market Condition

In fiscal 2018, the Company granted 88 market performance stock units to certain executives. The vesting of these awards is contingent upon the Company meeting certain total shareholder return (TSR) levels as compared to a market index over the next three years. The awards vest in three annual tranches and have a maximum potential to vest at 200% (176 shares) based on TSR performance. The related stock-based compensation expense is determined based on the estimated fair value of the underlying shares on the date of grant and is recognized using the accelerated method over the vesting term. The estimated fair value was calculated using a Monte Carlo simulation model. The weighted average fair value of the awards granted during the year was $78.28 per share. The awards are included in the restricted stock unit table above.

Employee Stock Purchase Plan

The Employee Stock Purchase Plan (the “Purchase Plan”) is a shareholder approved plan under which substantially all employees may purchase the Company’s common stock through payroll deductions at a price equal to 85% of the lower of the fair market values of the stock as of the beginning or the end of six-month offering periods. An employee’s payroll deductions under the Purchase Plan are limited to 10% of the employee’s salary and employees may not purchase more than $25 of stock during any calendar year. Employees purchased 234 shares in exchange for $10,282 of proceeds in fiscal 2018 and 243 shares in exchange for $8,634 of proceeds in fiscal 2017. The Purchase Plan is considered compensatory and the fair value of the discount and look back provision are estimated using the Black-Scholes formula and recognized over the six month withholding period prior to purchase. The total expense associated with the Purchase Plan for fiscal 2018, 2017 and 2016 was $2,848, $2,620 and $2,418, respectively. As of March 31, 2018, there was approximately $1,171 of unrecognized cost related to the current purchase period of our Employee Stock Purchase Plan.

Income Taxes

12 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Impact of U.S. Tax Reform

The Tax Cuts and Jobs Act (the Act) was enacted on December 22, 2017. Among the changes to the law, the Act reduces the U.S. federal corporate tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred and creates new taxes on certain foreign sourced earnings. As of March 31, 2018, the Company has not completed the accounting for the tax effects of enactment of the Act; however, as described below, it has made a reasonable estimate of the effects on existing deferred tax balances. These amounts are provisional and subject to change. The most significant impact of the legislation for the Company was a $18,040 reduction of the value of the Company's net deferred tax assets (which represent future tax benefits) as a result of lowering the U.S. corporate income tax rate from 35% to 21%. The Act also includes a requirement to pay a one-time transition tax on the cumulative value of earnings and profits that were previously not repatriated for U.S. income tax purposes. The Company has not made sufficient progress on the transition tax analysis to reasonably estimate the effects, and therefore, has not recorded provisional amounts. However, based on analysis to date the one-time transition tax is not expected to be material. No additional income taxes have been provided for any remaining undistributed foreign earnings not subject to the transition tax, or any additional outside basis difference inherent in these entities, as these amounts continue to be indefinitely reinvested in foreign operations.

The Act also subjects a U.S. shareholder to tax on global intangible low-taxed income (GILTI) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred. Given the complexity of the GILTI provisions, the Company is still evaluating the effects of the GILTI provisions and has not yet determined its accounting policy. At March 31, 2018, because the Company is still evaluating the GILTI provisions and analysis of future taxable income that is subject to GILTI, it is unable to make a reasonable estimate and has not reflected any adjustments related to GILTI in the financial statements.

The Act requires complex computations to be performed that were not previously required in U.S. tax law, judgments to be made in interpretation of the provisions of the Act, estimates in calculations, and the preparation and analysis of information not previously relevant or regularly produced. The U.S. Treasury Department, the Internal Revenue Service ("RS), and other standard-setting bodies could interpret or issue guidance on how provisions of the Tax Act will be applied or otherwise administered that is different from our current interpretation.

Valuation Allowance

Net deferred tax assets arise due to the recognition of income and expense items for tax purposes, which differ from those used for financial statement purposes. ASC 740, Income Taxes, provides for the recognition of deferred tax assets if realization of such assets is more likely than not. In assessing the need for a valuation allowance in fiscal 2018, the Company considered all available objective and verifiable evidence both positive and negative, including historical levels of pre-tax income (loss) both on a consolidated basis and tax reporting entity basis, legislative developments, expectations and risks associated with estimates of future pre-tax income, and prudent and feasible tax planning strategies. As a result of this analysis, the Company determined that it is more likely than not that it will not realize the benefits of its gross deferred tax assets and therefore has recorded a valuation allowance to reduce the carrying value of these gross deferred tax assets, net of the impact of the reversal of taxable temporary differences, to zero.

The components of income (loss) before income taxes were as follows:



	Year Ended March 31,
	2018			2017			2016
Domestic	$	(18,159	)	$	(7,860	)	$	(6,534	)
Foreign	14,659			5,866			10,490
	$	(3,500	)	$	(1,994	)	$	3,956

The components of income tax expense (benefit) were as follows:



	Year Ended March 31,
	2018			2017			2016
Current:
Federal	$	(1,036	)	$	6,360		$	4,983
State	(383		)	(958		)	1,076
Foreign	7,307			4,818			4,982
Deferred:
Federal	57,582			(11,520		)	(9,137		)
State	(4,601		)	(80		)	334
Foreign	(469		)	(106		)	(2		)
	$	58,400		$	(1,486	)	$	2,236

A reconciliation of the statutory tax rates and the effective tax rates for the years ended March 31, 2018, 2017 and 2016 are as follows:



	Year Ended March 31,
	2018		2017		2016
Statutory federal income tax expense (benefit) rate	(31.6	)%	(35.0	)%	35.0	%
State and local income tax expense, net of federal income tax effect	20.5	%	2.9	%	5.2	%
Impact of limit on executive compensation	—	%	—	%	—	%
Foreign earnings taxed at different rates	63.0	%	131.5	%	31.7	%
Domestic permanent differences	65.6	%	96.6	%	54.5	%
Foreign tax credits	(39.2	)%	(67.7	)%	(25.2	)%
Research credits	(83.2	)%	(163.2	)%	(65.9	)%
Tax reserves	(7.0	)%	4.1	%	4.1	%
Valuation allowance	1,626.5	%	(31.8	)%	23.4	%
Statutory tax rate changes	451.9	%	15.9	%	(9.4	)%
Stock-based compensation	(377.6	)%	—	%	—	%
Other differences, net	(20.3	)%	(27.8	)%	3.1	%
Effective income tax expense (benefit)	1,668.6	%	(74.5	)%	56.5	%

The significant components of the Company’s deferred tax assets are as follows:



	March 31,
	2018			2017
Deferred tax assets:
Net operating losses	$	9,015		$	—
Equity investment	1,162			—
Stock-based compensation	31,077			45,867
Deferred revenue	12,670			11,810
Tax credits	15,240			12,810
Accrued expenses	1,400			1,249
Allowance for doubtful accounts and other reserves	543			601
Less: valuation allowance	(58,350		)	(1,796		)
Total deferred tax assets	12,757			70,541
Deferred tax liabilities:
Depreciation and amortization	(6,172		)	(9,523		)
Deferred commissions and other	(9,015		)	(10,790		)
Total deferred tax liabilities	$	(15,187	)	$	(20,313	)
Net deferred tax asset (liability)	$	(2,430	)	$	50,228

It is the Company’s intention to reinvest undistributed earnings of its foreign subsidiaries and thereby infinitely postpone their remittance. In the event it needed to repatriate funds from outside of the United States, such repatriation would likely be subject to restrictions by local laws and/or tax consequences including foreign withholding taxes. It is not currently practical to estimate the legal restrictions or tax liability that would arise from such repatriations.

At March 31, 2018, the Company had a $30,888 federal net operating loss that was generated during fiscal 2018. This net operating loss is allowed to be carryforward indefinitely and has no annual limitations on its utilization to offset future federal taxable income. The Company also had federal and state research tax credit (R&D credits) carryforwards of approximately $3,468 and $3,142, respectively. The federal research tax credit carryforwards expire from 2025 through 2036, and the state research tax credit carryforwards expire from 2018 through 2023.

The Company conducts business globally and as a result, files income tax returns in the United States and in various state and foreign jurisdictions. In the normal course of business, the Company is subject to examination by taxing authorities throughout the world, including such major jurisdictions are the United States, Australia, Canada, Germany, Netherlands and United Kingdom. The following table summarizes the tax years in the Company’s major tax jurisdictions that remain subject to income tax examinations by tax authorities as of March 31, 2018. The years subject to income tax examination in the Company’s foreign jurisdictions cover the maximum time period with respect to these jurisdictions. Due to NOL carryforwards, in some cases the tax years continue to remain subject to examination with respect to such NOLs.



Tax Jurisdiction	Years Subject to Income Tax Examination
U.S. Federal	2014 - Present
Foreign jurisdictions	2013 - Present

The calculation of the Company’s tax liabilities involves dealing with uncertainties in the application of complex tax regulations in each of its tax jurisdictions. The number of years with open tax audits varies depending on the tax jurisdiction. A number of years may lapse before a particular matter is audited and finally resolved. A reconciliation of the amounts of unrecognized tax benefits is as follows:



Balance at March 31, 2015	$	2,005
Additions for tax positions related to fiscal 2016	—
Additions for tax positions related to prior years	170
Settlements and effective settlements with tax authorities and remeasurements	(171		)
Reductions related to the expiration of statutes of limitations	(64		)
Foreign currency translation adjustment	12
Balance at March 31, 2016	1,952
Additions for tax positions related to fiscal 2017	—
Additions for tax positions related to prior years	179
Settlements and effective settlements with tax authorities and remeasurements	—
Reductions related to the expiration of statutes of limitations	—
Foreign currency translation adjustment	(33		)
Balance at March 31, 2017	2,098
Additions for tax positions related to fiscal 2018	—
Additions for tax positions related to prior years	150
Settlements and effective settlements with tax authorities and remeasurements	—
Reductions related to the expiration of statutes of limitations	(397		)
Foreign currency translation adjustment	(111		)
Balance at March 31, 2018	$	1,740

The Company estimates that no significant remaining unrecognized tax benefits will be realized during the fiscal year ending March 31, 2019. Interest and penalties related to unrecognized tax benefits are recorded in income tax expense. In the years ended March 31, 2018, 2017 and 2016, the Company recognized $80, $61 and $52, respectively, of interest and penalties in the Consolidated Statement of Operations.

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Mar. 31, 2018
Retirement Benefits [Abstract]
Employee Benefit Plan	Employee Benefit Plan The Company has a defined contribution plan, as allowed under Section 401(k) of the Internal Revenue Code, covering substantially all employees. Effective January 1, 2012, the Company makes contributions equal to a discretionary percentage of the employee’s contributions determined by the Company. During the years ended March 31, 2018, 2017 and 2016, the Company made contributions of $2,959, $2,998, and $2,047, respectively.

Segment Information

12 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

The Company operates in one segment. The Company’s products and services are sold throughout the world, through direct and indirect sales channels. The Company’s chief operating decision maker (the “CODM”) is the chief executive officer. The CODM makes operating performance assessment and resource allocation decisions on a global basis. The CODM does not receive discrete financial information about asset allocation, expense allocation or profitability by product or geography.

Revenues by geography are based upon the billing address of the customer. All transfers between geographic regions have been eliminated from consolidated revenues. The following table sets forth revenue and long-lived assets by geographic area:



	Year Ended March 31,
	2018		2017		2016
Revenue:
United States	$	377,934	$	365,354	$	341,822
Other	321,459		279,651		251,945
	$	699,393	$	645,005	$	593,767

No individual country other than the United States accounts for 10% or more of revenues in the years ended March 31, 2018, 2017 and 2016. Revenue included in the “Other” caption above primarily relates to the Company’s operations in Europe, Australia, Canada and Asia.



	March 31,
	2018		2017
Long-lived assets:
United States	$	145,918	$	131,083
Other	25,936		8,509
	$	171,854	$	139,592

At March 31, 2018 and 2017 no other individual country, other than the United States, accounts for 10% or more of long-lived assets.

Selected Quarterly Financial Data (unaudited)

12 Months Ended

Mar. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (unaudited)



	Quarter Ended
	June 30			September 30			December 31			March 31
Fiscal 2018
Total revenue	$	165,972		$	168,140		$	180,366		$	184,915
Gross margin	144,311			144,873			155,409			156,648
Net income (loss)	(284		)	(1,010		)	(58,945		)	(1,661		)
Net income (loss) per common share:
Basic (1)	$	(0.01	)	$	(0.02	)	$	(1.30	)	$	(0.04	)
Diluted (1)	$	(0.01	)	$	(0.02	)	$	(1.30	)	$	(0.04	)
	Quarter Ended
	June 30			September 30			December 31			March 31
Fiscal 2017	As Adjusted
Total revenue	$	151,774		$	159,438		$	167,061		$	166,732
Gross margin	130,779			137,781			145,895			145,358
Net income (loss)	(2,610		)	(54		)	1,959			197
Net income (loss) per common share:
Basic (1)	$	(0.06	)	$	—		$	0.04		$	0.00
Diluted (1)	$	(0.06	)	$	—		$	0.04		$	0.00


(1)	Per common share amounts for the quarters and full year have been calculated separately. Accordingly, quarterly amounts do not add to the annual amount because of differences in the weighted average common shares outstanding during each period used in the basic and diluted calculations.

Subsequent Event

12 Months Ended

Mar. 31, 2018

Subsequent Events [Abstract]

Subsequent Event

On May 1, 2018, the Company announced governance and operational initiatives designed to support its new strategic transformation plan, called Commvault Advance. These initiatives included the following actions -

•

N. Robert Hammer and the Commvault Board of Directors have determined that it is the appropriate time to begin a search for a new CEO to lead the Company through its anticipated next stage of growth. The Commvault Board will appoint a search committee and will retain an executive search firm to assist with the external search. Mr. Hammer will continue to lead Commvault as Chairman, CEO and President until his successor is appointed. It is anticipated that Mr. Hammer will remain as Chairman of the Board after his successor is appointed.


•	The Commvault Board of Directors will appoint two new independent directors prior to the 2018 Annual Meeting of Shareholders. Upon these appointments, two existing Board members will resign, resulting in a Board that continues to be comprised of 11 directors.

•

Commvault’s Board has also formed an Operations Committee comprised of two existing independent directors and the two new directors, which will work closely with the Company’s management team on a comprehensive review of Commvault’s business to identify additional opportunities to further propel Commvault Advance and its profitable growth and value creation objectives. The Company will engage a leading outside consultant to work with the Operations Committee on this review.

•

A restructuring plan to increase efficiency in its sales, marketing and distribution functions as well as reduce costs across all functional areas of the Company. As part of this strategic initiative, the Company’s workforce will be reduced by approximately 4%. The Company expects to incur total pre-tax charges of approximately $6,000 to $8,000, most of which will be recognized in the first quarter of fiscal 2019. These restructuring charges relate primarily to severance and related costs associated with headcount reductions.

Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Mar. 31, 2018

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

Schedule II — Valuation and Qualifying Accounts



	Balance at Beginning of Year		Charged (Credited) to Costs and Expenses			Deductions		Balance at End of Year
	(In thousands)
Year Ended March 31, 2016
Allowance for doubtful accounts	$	104	$	247		$	36	$	315
Valuation allowance for deferred taxes	$	1,343	$	1,429		$	—	$	2,772
Year Ended March 31, 2017
Allowance for doubtful accounts	$	315	$	(161	)	$	51	$	103
Valuation allowance for deferred taxes	$	2,772	$	(976	)	$	—	$	1,796
Year Ended March 31, 2018
Allowance for doubtful accounts	$	103	$	25		$	24	$	104
Valuation allowance for deferred taxes	$	1,796	$	56,554		$	—	$	58,350

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Basis of Presentation

The consolidated financial statements include the accounts of the Company. All intercompany transactions and balances have been eliminated.

Use of Estimates

Revenue

Net Income per Common Share

Software Development Costs

Trade and Other Receivables

Accounting for Income Taxes

Cash and Cash Equivalents

Short-term Investments

Concentration of Credit Risk

The Company grants credit to customers in a wide variety of industries worldwide and generally does not require collateral. Credit losses relating to these customers have been minimal.

Fair Value of Financial Instruments

Level 1 — Quoted prices in active markets for identical assets or liabilities.

Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Property and Equipment

Asset Retirement Obligation

Long-Lived Assets

Equity Method Investment

Deferred Commissions Cost

Deferred Revenue

Accounting for Stock-Based Compensation

Share Repurchases

Sales Tax

The Company records revenue net of sales tax.

Advertising Costs

The Company expenses advertising costs as incurred.

Shipping and Handling Costs

Shipping and handling costs are included in cost of revenues for all periods presented.

Foreign Currency Translation

Foreign currency transaction gains and losses are recorded in “General and administrative expenses” in the Consolidated Statements of Operations.

Comprehensive Income (Loss)

Comprehensive income (loss) is defined to include all changes in equity, except those resulting from investments by stockholders and distribution to stockholders.

Recently Issued Accounting Standards

Revenue Recognition

Select adjusted unaudited financial statement information, which reflect the adoption of Topic 606 is below. The Company’s historical net cash flows are not impacted by this accounting change.



	Year Ended March 31, 2016
	As Reported			Adjustments			Recast for Adoption of ASC 606
Revenues:
Software and products	$	258,793		$	(702	)	$	258,091
Services	336,333			(657		)	335,676
Total revenues	595,126			(1,359		)	593,767
Total cost of revenues	82,712			—			82,712
Gross margin	512,414			(1,359		)	511,055
Total operating expenses	510,415			(3,470		)	506,945
Income from operations	1,999			2,111			4,110
Interest expense	(933		)	—			(933		)
Interest income	862			—			862
Equity in loss of affiliate	(83		)	—			(83		)
Income before income taxes	1,845			2,111			3,956
Income tax expense	1,709			527			2,236
Net income	$	136		$	1,584		$	1,720



	Year Ended March 31, 2017
	As Reported			Adjustments			Recast for Adoption of ASC 606
Revenues:
Software and products	$	296,421		$	(5,753	)	$	290,668
Services	354,097			240			354,337
Total revenues	650,518			(5,513		)	645,005
Total cost of revenues	85,192			—			85,192
Gross margin	565,326			(5,513		)	559,813
Total operating expenses	565,097			(4,042		)	561,055
Income (loss) from operations	229			(1,471		)	(1,242		)
Interest expense	(957		)	—			(957		)
Interest income	1,163			—			1,163
Equity in loss of affiliate	(958		)	—			(958		)
Loss before income taxes	(523		)	(1,471		)	(1,994		)
Income tax benefit	(1,063		)	(423		)	(1,486		)
Net income (loss)	$	540		$	(1,048	)	$	(508	)



	March 31, 2017
	Balance Sheet Data
	As Reported			Adjustments			Recast for Adoption of ASC 606
Current assets:
Trade accounts receivable	$	132,761		$	7,323		$	140,084
Total current assets	$	598,736		$	7,323		$	606,059
Deferred tax assets, net	$	61,018		$	(10,790	)	$	50,228
Deferred commissions	$	—		$	30,378		$	30,378
Total assets	$	802,967		$	26,911		$	829,878
Current Liabilities:
Deferred revenue	$	206,777		$	2,322		$	209,099
Total current liabilities	$	285,595		$	2,322		$	287,917
Other liabilities	$	3,934		$	292		$	4,226
Accumulated deficit	$	(239,974	)	$	24,297		$	(215,677	)
Total stockholders’ equity	$	442,635		$	24,297		$	466,932
Total liabilities and stockholders’ equity	$	802,967		$	26,911		$	829,878



	Year Ended March 31, 2016
	As Reported			Adjustments			Recast for Adoption of ASC 606
Cash flows from operating activities
Net income	$	136		$	1,584		$	1,720
Deferred income taxes	$	(9,332	)	$	527		$	(8,805	)
Amortization of deferred commissions cost	$	—		$	11,234		$	11,234
Changes in operating assets and liabilities:
Trade accounts receivable	$	3,879		$	(2,119	)	$	1,760
Other current assets and Other assets	$	2,843		$	1,024		$	3,867
Deferred commissions cost	$	—		$	(12,868	)	$	(12,868	)
Deferred revenue	$	16,317		$	618		$	16,935



	Year Ended March 31, 2017
	As Reported			Adjustments			Recast for Adoption of ASC 606
Cash flows from operating activities
Net income (loss)	$	540		$	(1,048	)	$	(508	)
Deferred income taxes	$	(11,045	)	$	(423	)	$	(11,468	)
Amortization of deferred commissions cost	$	—		$	16,065		$	16,065
Changes in operating assets and liabilities:
Trade accounts receivable	$	(21,493	)	$	5,121		$	(16,372	)
Deferred commissions cost	$	—		$	(18,393	)	$	(18,393	)
Deferred revenue	$	37,988		$	(1,322	)	$	36,666

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Computation of Basic and Diluted Net Income Per Common Share

The following table sets forth the computation of diluted net income per common share:



	Year Ended March 31,
	2018			2017			2016
Diluted net income (loss) per common share:
Basic weighted average shares outstanding	45,242			44,700			45,159
Dilutive effect of stock options, restricted stock units, and employee stock purchase plan	—			—			1,330
Diluted weighted average shares outstanding	45,242			44,700			46,489
Diluted net income per common share	$	(1.37	)	$	(0.01	)	$	0.04

Summary of Potential Outstanding Common Stock Equivalents



	Year Ended March 31,
	2018	2017	2016
Stock options, restricted stock units, and shares under the employee stock purchase plan	7,312	8,106	4,183

Financial Assets Measured At Fair Value On Recurring Basis

The following table summarizes the composition of the Company’s financial assets measured at fair value on a recurring basis at March 31, 2018 and March 31, 2017:



March 31, 2018	Level 1		Level 2		Level 3	Total
Cash equivalents	$	43,545	—		—	$	43,545
Short-term investments	—		$	132,263	—	$	132,263



March 31, 2017	Level 1		Level 2		Level 3	Total
Cash equivalents	$	70,190	—		—	$	70,190
Short-term investments	—		$	120,989	—	$	120,989

New Accounting Pronouncement, Early Adoption



	Year Ended March 31, 2016
	As Reported			Adjustments			Recast for Adoption of ASC 606
Revenues:
Software and products	$	258,793		$	(702	)	$	258,091
Services	336,333			(657		)	335,676
Total revenues	595,126			(1,359		)	593,767
Total cost of revenues	82,712			—			82,712
Gross margin	512,414			(1,359		)	511,055
Total operating expenses	510,415			(3,470		)	506,945
Income from operations	1,999			2,111			4,110
Interest expense	(933		)	—			(933		)
Interest income	862			—			862
Equity in loss of affiliate	(83		)	—			(83		)
Income before income taxes	1,845			2,111			3,956
Income tax expense	1,709			527			2,236
Net income	$	136		$	1,584		$	1,720



	Year Ended March 31, 2017
	As Reported			Adjustments			Recast for Adoption of ASC 606
Revenues:
Software and products	$	296,421		$	(5,753	)	$	290,668
Services	354,097			240			354,337
Total revenues	650,518			(5,513		)	645,005
Total cost of revenues	85,192			—			85,192
Gross margin	565,326			(5,513		)	559,813
Total operating expenses	565,097			(4,042		)	561,055
Income (loss) from operations	229			(1,471		)	(1,242		)
Interest expense	(957		)	—			(957		)
Interest income	1,163			—			1,163
Equity in loss of affiliate	(958		)	—			(958		)
Loss before income taxes	(523		)	(1,471		)	(1,994		)
Income tax benefit	(1,063		)	(423		)	(1,486		)
Net income (loss)	$	540		$	(1,048	)	$	(508	)



	March 31, 2017
	Balance Sheet Data
	As Reported			Adjustments			Recast for Adoption of ASC 606
Current assets:
Trade accounts receivable	$	132,761		$	7,323		$	140,084
Total current assets	$	598,736		$	7,323		$	606,059
Deferred tax assets, net	$	61,018		$	(10,790	)	$	50,228
Deferred commissions	$	—		$	30,378		$	30,378
Total assets	$	802,967		$	26,911		$	829,878
Current Liabilities:
Deferred revenue	$	206,777		$	2,322		$	209,099
Total current liabilities	$	285,595		$	2,322		$	287,917
Other liabilities	$	3,934		$	292		$	4,226
Accumulated deficit	$	(239,974	)	$	24,297		$	(215,677	)
Total stockholders’ equity	$	442,635		$	24,297		$	466,932
Total liabilities and stockholders’ equity	$	802,967		$	26,911		$	829,878



	Year Ended March 31, 2016
	As Reported			Adjustments			Recast for Adoption of ASC 606
Cash flows from operating activities
Net income	$	136		$	1,584		$	1,720
Deferred income taxes	$	(9,332	)	$	527		$	(8,805	)
Amortization of deferred commissions cost	$	—		$	11,234		$	11,234
Changes in operating assets and liabilities:
Trade accounts receivable	$	3,879		$	(2,119	)	$	1,760
Other current assets and Other assets	$	2,843		$	1,024		$	3,867
Deferred commissions cost	$	—		$	(12,868	)	$	(12,868	)
Deferred revenue	$	16,317		$	618		$	16,935



	Year Ended March 31, 2017
	As Reported			Adjustments			Recast for Adoption of ASC 606
Cash flows from operating activities
Net income (loss)	$	540		$	(1,048	)	$	(508	)
Deferred income taxes	$	(11,045	)	$	(423	)	$	(11,468	)
Amortization of deferred commissions cost	$	—		$	16,065		$	16,065
Changes in operating assets and liabilities:
Trade accounts receivable	$	(21,493	)	$	5,121		$	(16,372	)
Deferred commissions cost	$	—		$	(18,393	)	$	(18,393	)
Deferred revenue	$	37,988		$	(1,322	)	$	36,666

Revenue (Tables)

12 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

The Company’s typical performance obligations include the following:



Performance Obligation	When Performance Obligation is Typically Satisfied	When Payment is Typically Due	How Standalone Selling Price is Typically Estimated
Software and Products Revenue
Software Licenses	Upon shipment or made available for download (point in time)	Within 90 days of shipment except for certain subscription licenses which are paid for over time	Residual approach
Appliances	When control of the appliances passes to the customer; typically upon delivery	Within 90 days of delivery except for certain subscriptions which are paid for over time	Residual approach
Customer Support Revenue
Software Updates	Ratably over the course of the support contract (over time)	At the beginning of the contract period	Observable in renewal transactions
Customer Support	Ratably over the course of the support contract (over time)	At the beginning of the contract period	Observable in renewal transactions
Professional Services
Other Professional Services (except for education services)	As work is performed (over time)	Within 90 days of services being performed	Observable in transactions without multiple performance obligations
Education Services	When the class is taught (point in time)	Within 90 days of services being performed	Observable in transactions without multiple performance obligations

Disaggregation of Revenue



	Year Ended March 31, 2018
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	167,858	$	100,452	$	43,435	$	311,745
Customer Support Revenue	233,991		75,807		36,257		346,055
Professional Services	23,453		11,289		6,851		41,593
Total Revenue	$	425,302	$	187,548	$	86,543	$	699,393



	Year Ended March 31, 2017
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	168,243	$	82,393	$	40,032	$	290,668
Customer Support Revenue	216,656		65,732		32,466		314,854
Professional Services	22,704		11,364		5,415		39,483
Total Revenue	$	407,603	$	159,489	$	77,913	$	645,005



	Year Ended March 31, 2016
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	153,281	$	75,389	$	29,421	$	258,091
Customer Support Revenue	204,223		61,052		29,039		294,314
Professional Services	24,391		11,195		5,776		41,362
Total Revenue	$	381,895	$	147,636	$	64,236	$	593,767

Contract with Customer, Asset and Liability

The opening and closing balances of the Company’s accounts receivable, unbilled receivables, and deferred revenues are as follows:



	Accounts Receivable		Unbilled Receivable (current)		Unbilled Receivable (long-term)		Deferred Revenue (current)		Deferred Revenue (long-term)
Opening Balance as of March 31, 2017	$	132,711	$	7,373	$	—	$	209,099	$	70,803
Increase, net	19,508		2,527		4,380		32,014		13,858
Ending Balance as of March 31, 2018	$	152,219	$	9,900	$	4,380	$	241,113	$	84,661

Property and Equipment (Tables)

12 Months Ended

Mar. 31, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment consist of the following:



	March 31,
	2018			2017
Land	$	9,445		$	9,445
Buildings	103,244			103,244
Computers, servers and other equipment	37,132			35,274
Furniture and fixtures	15,594			14,912
Leasehold improvements	10,143			7,040
Purchased software	1,425			1,335
Construction in process	57			1,147
	177,040			172,397
Less: Accumulated depreciation and amortization	(48,428		)	(40,078		)
	$	128,612		$	132,319

Accrued Liabilities (Tables)

12 Months Ended

Mar. 31, 2018

Payables and Accruals [Abstract]

Accrued Liabilities

Accrued liabilities consist of the following:



	March 31,
	2018		2017
Compensation and related payroll taxes	$	46,192	$	45,149
Other	36,107		33,552
	$	82,299	$	78,701

Commitments and Contingencies (Tables)

12 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Payments Under All Operating Leases

Future minimum lease payments under all operating leases at March 31, 2018 are as follows:



Year Ending March 31,
2019	$	9,858
2020	8,316
2021	6,558
2022	4,449
2023 and thereafter	3,746
	$	32,927

Stock Plans (Tables)

12 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock Option Valuation Assumptions

The assumptions used in the Black-Scholes option-pricing model are as follows:



		Year Ended March 31,
		2016
Dividend yield		None
Expected volatility		39% - 43%
Weighted average expected volatility		41%
Risk-free interest rates		1.29% - 1.75%
Weighted average expected life (in years)		4.6

Schedule of Stock Option Activity

The following summarizes the activity for the Company’s stock incentive plans from March 31, 2015 to March 31, 2018:



Options	Number of Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding at March 31, 2015	6,853		$	40.91
Options granted	148		41.84
Options exercised	(764	)	8.80
Options forfeited	(172	)	59.79
Options expired	(126	)	61.81
Outstanding at March 31, 2016	5,939		44.07
Options granted	—		—
Options exercised	(446	)	28.44
Options forfeited	(77	)	51.55
Options expired	(116	)	68.98
Outstanding at March 31, 2017	5,300		44.74
Options granted	—		—
Options exercised	(842	)	23.57
Options forfeited	(26	)	43.30
Options expired	(30	)	68.27
Outstanding at March 31, 2018	4,402		$	48.64	4.16	$	65,223
Exercisable at March 31, 2018	4,210		$	48.81	4.05	$	62,888

Schedule of Restricted Stock Unit Activity

Restricted stock unit activity is as follows:



Non-Vested Restricted Stock Units	Number of Awards		Weighted Average Grant Date Fair Value
Non-vested as of March 31, 2015	1,412		$	56.82
Granted	1,543		37.27
Vested	(547	)	38.38
Forfeited	(196	)	49.24
Non-vested as of March 31, 2016	2,212		43.43
Granted	1,333		50.66
Vested	(975	)	51.35
Forfeited	(174	)	43.56
Non-vested as of March 31, 2017	2,396		45.53
Granted	1,235		59.71
Vested	(1,324	)	46.74
Forfeited	(141	)	48.24
Non-vested as of March 31, 2018	2,166		$	54.13

Stock-Based Compensation Expense



	Year Ended March 31,
	2018		2017		2016
Cost of services revenue	$	3,182	$	3,925	$	3,106
Sales and marketing	36,917		34,005		28,557
Research and development	8,411		7,335		6,722
General and administrative	25,619		28,663		25,811
Stock-based compensation expense	$	74,129	$	73,928	$	64,196

Income Taxes (Tables)

12 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Components of Income Before Income Taxes

The components of income (loss) before income taxes were as follows:



	Year Ended March 31,
	2018			2017			2016
Domestic	$	(18,159	)	$	(7,860	)	$	(6,534	)
Foreign	14,659			5,866			10,490
	$	(3,500	)	$	(1,994	)	$	3,956

Components of Income Tax Expense (Benefit)

The components of income tax expense (benefit) were as follows:



	Year Ended March 31,
	2018			2017			2016
Current:
Federal	$	(1,036	)	$	6,360		$	4,983
State	(383		)	(958		)	1,076
Foreign	7,307			4,818			4,982
Deferred:
Federal	57,582			(11,520		)	(9,137		)
State	(4,601		)	(80		)	334
Foreign	(469		)	(106		)	(2		)
	$	58,400		$	(1,486	)	$	2,236

Reconciliation of Statutory Tax Rates and Effective Tax Rates

A reconciliation of the statutory tax rates and the effective tax rates for the years ended March 31, 2018, 2017 and 2016 are as follows:



	Year Ended March 31,
	2018		2017		2016
Statutory federal income tax expense (benefit) rate	(31.6	)%	(35.0	)%	35.0	%
State and local income tax expense, net of federal income tax effect	20.5	%	2.9	%	5.2	%
Impact of limit on executive compensation	—	%	—	%	—	%
Foreign earnings taxed at different rates	63.0	%	131.5	%	31.7	%
Domestic permanent differences	65.6	%	96.6	%	54.5	%
Foreign tax credits	(39.2	)%	(67.7	)%	(25.2	)%
Research credits	(83.2	)%	(163.2	)%	(65.9	)%
Tax reserves	(7.0	)%	4.1	%	4.1	%
Valuation allowance	1,626.5	%	(31.8	)%	23.4	%
Statutory tax rate changes	451.9	%	15.9	%	(9.4	)%
Stock-based compensation	(377.6	)%	—	%	—	%
Other differences, net	(20.3	)%	(27.8	)%	3.1	%
Effective income tax expense (benefit)	1,668.6	%	(74.5	)%	56.5	%

Components of Deferred Tax Assets

The significant components of the Company’s deferred tax assets are as follows:



	March 31,
	2018			2017
Deferred tax assets:
Net operating losses	$	9,015		$	—
Equity investment	1,162			—
Stock-based compensation	31,077			45,867
Deferred revenue	12,670			11,810
Tax credits	15,240			12,810
Accrued expenses	1,400			1,249
Allowance for doubtful accounts and other reserves	543			601
Less: valuation allowance	(58,350		)	(1,796		)
Total deferred tax assets	12,757			70,541
Deferred tax liabilities:
Depreciation and amortization	(6,172		)	(9,523		)
Deferred commissions and other	(9,015		)	(10,790		)
Total deferred tax liabilities	$	(15,187	)	$	(20,313	)
Net deferred tax asset (liability)	$	(2,430	)	$	50,228

Schedule of Tax Years Subject to Income Tax Examination

The following table summarizes the tax years in the Company’s major tax jurisdictions that remain subject to income tax examinations by tax authorities as of March 31, 2018. The years subject to income tax examination in the Company’s foreign jurisdictions cover the maximum time period with respect to these jurisdictions. Due to NOL carryforwards, in some cases the tax years continue to remain subject to examination with respect to such NOLs.



Tax Jurisdiction	Years Subject to Income Tax Examination
U.S. Federal	2014 - Present
Foreign jurisdictions	2013 - Present

Reconciliation of Amounts of Unrecognized Tax Benefits

A reconciliation of the amounts of unrecognized tax benefits is as follows:



Balance at March 31, 2015	$	2,005
Additions for tax positions related to fiscal 2016	—
Additions for tax positions related to prior years	170
Settlements and effective settlements with tax authorities and remeasurements	(171		)
Reductions related to the expiration of statutes of limitations	(64		)
Foreign currency translation adjustment	12
Balance at March 31, 2016	1,952
Additions for tax positions related to fiscal 2017	—
Additions for tax positions related to prior years	179
Settlements and effective settlements with tax authorities and remeasurements	—
Reductions related to the expiration of statutes of limitations	—
Foreign currency translation adjustment	(33		)
Balance at March 31, 2017	2,098
Additions for tax positions related to fiscal 2018	—
Additions for tax positions related to prior years	150
Settlements and effective settlements with tax authorities and remeasurements	—
Reductions related to the expiration of statutes of limitations	(397		)
Foreign currency translation adjustment	(111		)
Balance at March 31, 2018	$	1,740

Segment Information (Tables)

12 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of Revenue by Geographic Area

The following table sets forth revenue and long-lived assets by geographic area:



	Year Ended March 31,
	2018		2017		2016
Revenue:
United States	$	377,934	$	365,354	$	341,822
Other	321,459		279,651		251,945
	$	699,393	$	645,005	$	593,767

Schedule of Long-Lived Assets by Geographic Area



	March 31,
	2018		2017
Long-lived assets:
United States	$	145,918	$	131,083
Other	25,936		8,509
	$	171,854	$	139,592

Selected Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Mar. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Selected Quarterly Financial Data



	Quarter Ended
	June 30			September 30			December 31			March 31
Fiscal 2018
Total revenue	$	165,972		$	168,140		$	180,366		$	184,915
Gross margin	144,311			144,873			155,409			156,648
Net income (loss)	(284		)	(1,010		)	(58,945		)	(1,661		)
Net income (loss) per common share:
Basic (1)	$	(0.01	)	$	(0.02	)	$	(1.30	)	$	(0.04	)
Diluted (1)	$	(0.01	)	$	(0.02	)	$	(1.30	)	$	(0.04	)
	Quarter Ended
	June 30			September 30			December 31			March 31
Fiscal 2017	As Adjusted
Total revenue	$	151,774		$	159,438		$	167,061		$	166,732
Gross margin	130,779			137,781			145,895			145,358
Net income (loss)	(2,610		)	(54		)	1,959			197
Net income (loss) per common share:
Basic (1)	$	(0.06	)	$	—		$	0.04		$	0.00
Diluted (1)	$	(0.06	)	$	—		$	0.04		$	0.00


(1)	Per common share amounts for the quarters and full year have been calculated separately. Accordingly, quarterly amounts do not add to the annual amount because of differences in the weighted average common shares outstanding during each period used in the basic and diluted calculations.

Summary of Significant Accounting Policies - Computation of Diluted Net Income Per Common Share (Detail) - $ / shares
shares in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2018

^[1]

Dec. 31, 2017

^[1]

Sep. 30, 2017

^[1]

Jun. 30, 2017

^[1]

Mar. 31, 2017

^[1]

Dec. 31, 2016

^[1]

Sep. 30, 2016

^[1]

Jun. 30, 2016

^[1]

Mar. 31, 2018

Mar. 31, 2017

Mar. 31, 2016

Diluted net income (loss) per common share:

Basic weighted average shares outstanding (shares)

45,242

44,700

45,159

Dilutive effect of stock options, restricted stock units, and employee stock purchase plan (in shares)

1,330

Diluted weighted average shares outstanding (in shares)

45,242

44,700

46,489

Diluted net income per common share (in dollars per share)

$ (0.04)

$ (1.30)

$ (0.02)

$ (0.01)

$ 0.00

$ 0.04

$ 0.00

$ (0.06)

$ (1.37)

$ (0.01)

$ 0.04

[1]	Per common share amounts for the quarters and full year have been calculated separately. Accordingly, quarterly amounts do not add to the annual amount because of differences in the weighted average common shares outstanding during each period used in the basic and diluted calculations.

Summary of Significant Accounting Policies - Summary of Potential Outstanding Common Stock Equivalents (Detail) - shares shares in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Accounting Policies [Abstract]
Stock options, restricted stock units, and shares under the employee stock purchase plan (in shares)	7,312	8,106	4,183

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Asset retirement obligation	$ 1,303,000	$ 1,204,000
Asset impairment charges	0	0	$ 0
Equity method investment	0	3,621,000
Advertising expenses	5,704,000	7,816,000	5,083,000
Net foreign currency transaction gain (loss)	$ 109,000	$ 644,000	$ 195,000
Laitek, Inc.
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage of equity method investment			34.00%
Minimum \| Buildings
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, depreciation period (in years)	10 years
Minimum \| Computers, servers and other equipment
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, depreciation period (in years)	18 months
Minimum \| Furniture and fixtures
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, depreciation period (in years)	3 years
Maximum \| Buildings
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, depreciation period (in years)	60 years
Maximum \| Computers, servers and other equipment
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, depreciation period (in years)	3 years
Maximum \| Furniture and fixtures
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, depreciation period (in years)	12 years
Revenue \| Arrow
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	36.00%	36.00%	38.00%
Accounts Receivable \| Customer Concentration Risk \| Arrow
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	38.00%	40.00%

Summary of Significant Accounting Policies - Summary of Fair Value of Financial Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 43,545	$ 70,190
Short-term investments	132,263	120,989
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	43,545	70,190
Short-term investments	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	132,263	120,989
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	$ 0	$ 0

Summary of Significant Accounting Policies - Related Party Transactions (Detail) - Director - Director on Company's board of directors hired as CEO of Rackspace, Inc. $ in Thousands	12 Months Ended
	Mar. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Revenue from related party	$ 10,024
Accounts receivable from related party	5,704
Software, licenses
Related Party Transaction [Line Items]
Revenue from related party	$ 4,756

Summary of Significant Accounting Policies - Recently Issued Accounting Standards - ASU 2014-09 I (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Software and products									$ 311,745	$ 290,668	$ 258,091
Services									387,648	354,337	335,676
Total revenues	$ 184,915	$ 180,366	$ 168,140	$ 165,972	$ 166,732	$ 167,061	$ 159,438	$ 151,774	699,393	645,005	593,767
Total cost of revenues									98,152	85,192	82,712
Gross margin	156,648	155,409	144,873	144,311	145,358	145,895	137,781	130,779	601,241	559,813	511,055
Total operating expenses									602,187	561,055	506,945
Income (loss) from operations									(946)	(1,242)	4,110
Interest expense									(1,161)	(957)	(933)
Interest income									2,228	1,163	862
Equity in loss of affiliate									(3,621)	(958)	(83)
Income (loss) before income taxes									(3,500)	(1,994)	3,956
Income tax expense (benefit)									58,400	(1,486)	2,236
Net income (loss)	$ (1,661)	$ (58,945)	$ (1,010)	$ (284)	$ 197	$ 1,959	$ (54)	$ (2,610)	$ (61,900)	(508)	1,720
As Reported
Revenues:
Net income (loss)										540	136
As Reported \| Accounting Standards Update 2014-09
Revenues:
Software and products										296,421	258,793
Services										354,097	336,333
Total revenues										650,518	595,126
Total cost of revenues										85,192	82,712
Gross margin										565,326	512,414
Total operating expenses										565,097	510,415
Income (loss) from operations										229	1,999
Interest expense										(957)	(933)
Interest income										1,163	862
Equity in loss of affiliate										(958)	(83)
Income (loss) before income taxes										(523)	1,845
Income tax expense (benefit)										(1,063)	1,709
Net income (loss)										540	136
Adjustments \| Accounting Standards Update 2014-09
Revenues:
Software and products										(5,753)	(702)
Services										240	(657)
Total revenues										(5,513)	(1,359)
Total cost of revenues										0	0
Gross margin										(5,513)	(1,359)
Total operating expenses										(4,042)	(3,470)
Income (loss) from operations										(1,471)	2,111
Interest expense										0	0
Interest income										0	0
Equity in loss of affiliate										0	0
Income (loss) before income taxes										(1,471)	2,111
Income tax expense (benefit)										(423)	527
Net income (loss)										$ (1,048)	$ 1,584

Summary of Significant Accounting Policies - Recently Issued Accounting Standards - ASU 2014-09 II (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Current assets:
Trade accounts receivable, net	$ 162,119	$ 140,084
Total current assets	646,788	606,059
Deferred tax assets, net	0	50,228
Deferred commissions		30,378
Total assets	818,642	829,878
Current Liabilities:
Deferred revenue	241,113	209,099
Total current liabilities	324,173	287,917
Other liabilities	3,314	4,226
Accumulated deficit	(373,678)	(215,677)
Total stockholders’ equity	404,064	466,932	$ 421,613	$ 430,771
Total liabilities and stockholders’ equity	$ 818,642	829,878
As Reported \| Accounting Standards Update 2014-09
Current assets:
Trade accounts receivable, net		132,761
Total current assets		598,736
Deferred tax assets, net		61,018
Deferred commissions		0
Total assets		802,967
Current Liabilities:
Deferred revenue		206,777
Total current liabilities		285,595
Other liabilities		3,934
Accumulated deficit		(239,974)
Total stockholders’ equity		442,635
Total liabilities and stockholders’ equity		802,967
Adjustments \| Accounting Standards Update 2014-09
Current assets:
Trade accounts receivable, net		7,323
Total current assets		7,323
Deferred tax assets, net		(10,790)
Deferred commissions		30,378
Total assets		26,911
Current Liabilities:
Deferred revenue		2,322
Total current liabilities		2,322
Other liabilities		292
Accumulated deficit		24,297
Total stockholders’ equity		24,297
Total liabilities and stockholders’ equity		$ 26,911

Summary of Significant Accounting Policies - Recently Issued Accounting Standards - ASU 2014-09 III (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income (loss)	$ (1,661)	$ (58,945)	$ (1,010)	$ (284)	$ 197	$ 1,959	$ (54)	$ (2,610)	$ (61,900)	$ (508)	$ 1,720
Deferred income taxes									53,737	(11,468)	(8,805)
Amortization of deferred commissions cost									16,587	16,065	11,234
Changes in operating assets and liabilities:
Trade accounts receivable									(25,082)	(16,372)	1,760
Other current assets and Other assets									(6,876)	(55)	3,867
Deferred commissions cost									(17,984)	(18,393)	(12,868)
Deferred revenue									$ 33,971	36,666	16,935
As Reported
Cash flows from operating activities
Net income (loss)										540	136
Deferred income taxes										(11,045)	(9,332)
Amortization of deferred commissions cost										0	0
Changes in operating assets and liabilities:
Trade accounts receivable										(21,493)	3,879
Other current assets and Other assets											2,843
Deferred commissions cost										0	0
Deferred revenue										37,988	16,317
As Reported \| Accounting Standards Update 2014-09
Cash flows from operating activities
Net income (loss)										540	136
Adjustments \| Accounting Standards Update 2014-09
Cash flows from operating activities
Net income (loss)										(1,048)	1,584
Deferred income taxes										(423)	527
Amortization of deferred commissions cost										16,065	11,234
Changes in operating assets and liabilities:
Trade accounts receivable										5,121	(2,119)
Other current assets and Other assets											1,024
Deferred commissions cost										(18,393)	(12,868)
Deferred revenue										$ (1,322)	$ 618

Revenue - Additional Information (Detail) $ in Thousands	12 Months Ended
Revenue - Additional Information (Detail) $ in Thousands	Mar. 31, 2018 USD ($) revenue_source segment
Revenue from Contract with Customer [Abstract]
Sources of primary revenue \| revenue_source	2
Customer support agreement	1 year
Number of operating segments \| segment	1
Revenue recognized in period, included in opening deferred revenue balance	$ 209,099
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized from remaining performance obligations	20,821
Software and Products Revenue
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized from remaining performance obligations	$ 320

Revenue - Performance Obligations (Detail)	12 Months Ended
Revenue - Performance Obligations (Detail)	Mar. 31, 2018
Software, licenses
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, expected payment terms	90 days
Software, appliances
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, expected payment terms	90 days
Professional Services, other
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, expected payment terms	90 days
Professional Services, education services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, expected payment terms	90 days

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Disaggregation of Revenue [Line Items]
Total Revenue	$ 699,393	$ 645,005	$ 593,767
Americas
Disaggregation of Revenue [Line Items]
Total Revenue	425,302	407,603	381,895
EMEA
Disaggregation of Revenue [Line Items]
Total Revenue	187,548	159,489	147,636
APAC
Disaggregation of Revenue [Line Items]
Total Revenue	86,543	77,913	64,236
Software and Products Revenue
Disaggregation of Revenue [Line Items]
Total Revenue	311,745	290,668	258,091
Software and Products Revenue \| Americas
Disaggregation of Revenue [Line Items]
Total Revenue	167,858	168,243	153,281
Software and Products Revenue \| EMEA
Disaggregation of Revenue [Line Items]
Total Revenue	100,452	82,393	75,389
Software and Products Revenue \| APAC
Disaggregation of Revenue [Line Items]
Total Revenue	43,435	40,032	29,421
Customer Support Revenue
Disaggregation of Revenue [Line Items]
Total Revenue	346,055	314,854	294,314
Customer Support Revenue \| Americas
Disaggregation of Revenue [Line Items]
Total Revenue	233,991	216,656	204,223
Customer Support Revenue \| EMEA
Disaggregation of Revenue [Line Items]
Total Revenue	75,807	65,732	61,052
Customer Support Revenue \| APAC
Disaggregation of Revenue [Line Items]
Total Revenue	36,257	32,466	29,039
Professional Services
Disaggregation of Revenue [Line Items]
Total Revenue	41,593	39,483	41,362
Professional Services \| Americas
Disaggregation of Revenue [Line Items]
Total Revenue	23,453	22,704	24,391
Professional Services \| EMEA
Disaggregation of Revenue [Line Items]
Total Revenue	11,289	11,364	11,195
Professional Services \| APAC
Disaggregation of Revenue [Line Items]
Total Revenue	$ 6,851	$ 5,415	$ 5,776

Revenue - Opening and Closing Balances (Receivables) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Accounts Receivable [Roll Forward]
Trade accounts receivable	$ 25,082	$ 16,372	$ (1,760)
Unbilled Receivable (long-term) [Roll Forward]
Opening Balance as of March 31, 2017	30,378
Ending Balance as of March 31, 2018		30,378
Trade accounts receivable
Accounts Receivable [Roll Forward]
Opening Balance as of March 31, 2017	132,711
Trade accounts receivable	19,508
Ending Balance as of March 31, 2018	152,219	132,711
Unbilled Receivable (current) [Roll Forward]
Opening Balance as of March 31, 2017	7,373
Increase, net	2,527
Ending Balance as of March 31, 2018	9,900	7,373
Other assets
Unbilled Receivable (long-term) [Roll Forward]
Opening Balance as of March 31, 2017	0
Increase, net	4,380
Ending Balance as of March 31, 2018	$ 4,380	$ 0

Revenue - Opening and Closing Balances (Deferred Revenue) (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2018 USD ($)
Deferred revenue
Contract With Customer, Liability, Current [Roll Forward]
Opening Balance as of March 31, 2017	$ 209,099
Increase, net	32,014
Ending Balance as of March 31, 2018	241,113
Deferred revenue, less current portion
Contract With Customer, Liability, Noncurrent [Roll Forward]
Opening Balance as of March 31, 2017	70,803
Increase, net	13,858
Ending Balance as of March 31, 2018	$ 84,661

Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 177,040	$ 172,397
Less: Accumulated depreciation and amortization	(48,428)	(40,078)
Property and equipment, net	128,612	132,319
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,445	9,445
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	103,244	103,244
Computers, servers and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	37,132	35,274
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,594	14,912
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,143	7,040
Purchased software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,425	1,335
Construction in process
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 57	$ 1,147

Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 11,217	$ 9,980	$ 10,927

Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Payables and Accruals [Abstract]
Compensation and related payroll taxes	$ 46,192	$ 45,149
Other	36,107	33,552
Total accrued liabilities	$ 82,299	$ 78,701

Commitments and Contingencies - Future Minimum Lease Payments Under All Operating Leases (Detail) $ in Thousands	Mar. 31, 2018 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	$ 9,858
2020	8,316
2021	6,558
2022	4,449
2023 and thereafter	3,746
Future minimum lease payments, Total	$ 32,927

Commitments and Contingencies - Additional Information (Detail)			12 Months Ended
	Oct. 02, 2017 USD ($)	Feb. 27, 2017 patent	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Rent expenses			$ 12,215,000	$ 10,377,000	$ 9,856,000
Non-cancellable purchase commitments, 2019			20,164,000
Non-cancellable purchase commitments, 2020			5,841,000
Non-cancellable purchase commitments, 2021			1,025,000
Non-cancellable purchase commitments, 2022			299,000
Non-cancellable purchase commitments, Total for all periods through fiscal 2022			27,329,000
Royalty expense			$ 4,462,000	2,646,000	1,933,000
Maximum software warranty period (in days)			90 days
Product warranty accrual			$ 0	$ 0	$ 0
Realtime Data LLC d/b/a IXO
Loss Contingencies [Line Items]
Number of patents involved in alleged infringement \| patent		4
Settled
Loss Contingencies [Line Items]
Settlement amount	$ 12,500,000

Revolving Credit Facility - Additional Information (Detail) - Revolving Credit Facility - USD ($)		12 Months Ended
	Feb. 08, 2018	Mar. 31, 2018	Mar. 31, 2017
Line of Credit Facility [Line Items]
Term (in years)	5 years
Borrowing capacity	$ 250,000,000
Commitment fee percentage	0.25%
Amortization of debt issuance expense		$ 568,000	$ 252,000
LIBOR
Line of Credit Facility [Line Items]
Variable rate (percent)	1.50%

Capitalization - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2018 USD ($) business_day $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2016 USD ($)	Nov. 13, 2008 right
Class of Stock [Line Items]
Number of rights declared as dividend distribution for each outstanding share of common stock \| right				1
Preferred stock, par value (in dollars per share) \| $ / shares	$ 0.01	$ 0.01
Description of exercise entitlement of each right	Each Right, when exercisable, entitles the registered holder to purchase one one-thousandth of a share of Series A Junior Participating Preferred Stock, par value $0.01 per share, at a purchase price of eighty dollars per one one-thousandth of a share, subject to adjustment.
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Conditions under which rights become exercisable	The Rights will become exercisable following the tenth business day after (i) a person or group announces the acquisition of 15% or more of the Company’s common stock or (ii) commencement of a tender or exchange offer, the consummation of which would result in ownership by the person or group of 15% or more of the Company’s common stock.
Period before rights become exercisable \| business_day	10
Minimum acquisition percentage of company stock needed for rights to become exercisable	15.00%
Redemption price of each right (in dollars per share) \| $ / shares	$ 0.001
Expiration date of rights	Nov. 14, 2018
Common stock, shares outstanding (in shares)	45,118,000	44,816,000
Common stock, par value (in dollars per share) \| $ / shares	$ 0.01	$ 0.01
Amount of common stock repurchased \| $	$ 112,218	$ 49,998	$ 91,477
Restricted Stock Units
Class of Stock [Line Items]
Options outstanding (in shares)	3,908,000
Common Stock Repurchased
Class of Stock [Line Items]
Amount of common stock repurchased \| $	$ 112,218
Number of shares repurchased (in shares)	2,098,000
Remaining value of common stock to be repurchased under share repurchase program \| $	$ 112,840
Series A Junior Participating Preferred
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share) \| $ / shares	$ 0.01
Exercise purchase price of preferred stock rights (in dollars per share) \| $ / shares	$ 80
Preferred stock, shares authorized (in shares)	150,000
Number of shares per Right (in shares)	0.001

Stock Plans - Additional Information (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2018 USD ($) stock_plan shares	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 87,814
Awards expected to be recognized over a weighted average period (in years)	1 year 3 days
Weighted average fair value of stock options granted per share (in dollars per share) \| $ / shares			$ 15.20
Total intrinsic value of options exercised	$ 26,547	$ 9,896	$ 23,391
Total fair value of restricted stock units - vested	$ 76,193	$ 50,051	$ 20,981
Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vesting period (in years)	4 years
Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vesting period (in years)	3 years
Equity Awards \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vesting period (in years)	1 year
Equity Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vesting period (in years)	3 years
2016 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans \| stock_plan	1
Options available for future grant (in shares) \| shares	1,742
2006 Long-Term Stock Inventive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans \| stock_plan	1

Stock Plans - Assumptions Used in Black-Scholes Option-Pricing Model (Detail)	12 Months Ended
	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility, minimum	39.00%
Expected volatility, maximum	43.00%
Weighted average expected volatility	41.00%
Risk-free interest rates, minimum	1.29%
Risk-free interest rates, maximum	1.75%
Weighted average expected life (in years)	4 years 7 months 6 days

Stock Plans - Activity for Company's Two Stock Incentive Plans (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Number of Options
Number of Options, Outstanding beginning balance (in shares)	5,300	5,939	6,853
Number of Options, Options granted (in shares)	0	0	148
Number of Options, Options exercised (in shares)	(842)	(446)	(764)
Number of Options, Options forfeited (in shares)	(26)	(77)	(172)
Number of Options, Options expired (in shares)	(30)	(116)	(126)
Number of Options, Outstanding ending balance (in shares)	4,402	5,300	5,939
Number of Options, Exercisable at March 31, 2018 (in shares)	4,210
Weighted- Average Exercise Price
Weighted-Average Exercise Price, Outstanding beginning balance (in dollars per share)	$ 44.74	$ 44.07	$ 40.91
Weighted-Average Exercise Price, Options granted (in dollars per share)	0.00	0.00	41.84
Weighted-Average Exercise Price, Options exercised (in dollars per share)	23.57	28.44	8.80
Weighted-Average Exercise Price, Options forfeited (in dollars per share)	43.30	51.55	59.79
Weighted-Average Exercise Price, Options expired (in dollars per share)	68.27	68.98	61.81
Weighted-Average Exercise Price, Outstanding ending balance (in dollars per share)	48.64	$ 44.74	$ 44.07
Weighted-Average Exercise Price, Exercisable at March 31, 2018 (in dollars per share)	$ 48.81
Weighted- Average Remaining Contractual Term (Years)
Weighted-Average Remaining Contractual Term, Outstanding at March 31, 2018 (in years)	4 years 1 month 27 days
Weighted-Average Remaining Contractual Term, Exercisable at March 31, 2018 (in years)	4 years 18 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding at March 31, 2018	$ 65,223
Aggregate Intrinsic Value, Exercisable at March 31, 2018	$ 62,888

Stock Plans - Restricted Stock Unit Activity (Detail) - Restricted Stock Units - $ / shares shares in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Number of Awards
Number of Awards, Non-vested beginning balance (in shares)	2,396	2,212	1,412
Number of Awards, Granted (in shares)	1,235	1,333	1,543
Number of Awards, Vested (in shares)	(1,324)	(975)	(547)
Number of Awards, Forfeited (in shares)	(141)	(174)	(196)
Number of Awards, Non-vested ending balance (in shares)	2,166	2,396	2,212
Weighted Average Grant Date Fair Value
Weighted Average grant Date Fair Value, Non-vested beginning balance (in dollars per share)	$ 45.53	$ 43.43	$ 56.82
Weighted Average grant Date Fair Value, Granted (in dollars per share)	59.71	50.66	37.27
Weighted Average grant Date Fair Value, Vested (in dollars per share)	46.74	51.35	38.38
Weighted Average grant Date Fair Value, Forfeited (in dollars per share)	48.24	43.56	49.24
Weighted Average grant Date Fair Value, Non-vested ending balance (in dollars per share)	$ 54.13	$ 45.53	$ 43.43

Stock Plans - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 74,129	$ 73,928	$ 64,196
Cost of services revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	3,182	3,925	3,106
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	36,917	34,005	28,557
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	8,411	7,335	6,722
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 25,619	$ 28,663	$ 25,811

Stock Plans - Performance-based and Market-based Awards (Detail)	12 Months Ended
	Mar. 31, 2018 tranche $ / shares shares
PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards, granted (in shares)	107,000
Number of annual tranches \| tranche	3
Maximum potential for awards to vest	200.00%
Maximum number of awards to vest (in shares)	214,000
Estimated number of awards to vest (in shares)	54.00%
Market performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards, granted (in shares)	88,000
Number of annual tranches \| tranche	3
Maximum potential for awards to vest	200.00%
Maximum number of awards to vest (in shares)	176,000
Stock options granted, vesting period (in years)	3 years
Weighted average grant date fair value, granted (in dollars per share) \| $ / shares	$ 78.28

Stock Plans - Employee Stock Purchase Plan (Detail) - USD ($) shares in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 74,129,000	$ 73,928,000	$ 64,196,000
Unrecognized stock-based compensation expense	$ 87,814,000
Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price as a percentage of fair market value	85.00%
Length of offering period (in months)	6 months
Maximum employee payroll percent deduction of salary	10.00%
Maximum amount of stock purchasable by employees within a calendar year	$ 25,000
Number of shares purchased by employees (in shares)	234	243
Proceeds received	$ 10,282,000	$ 8,634,000
Compensation expense	2,848,000	$ 2,620,000	$ 2,418,000
Unrecognized stock-based compensation expense	$ 1,171,000

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Tax Credit Carryforward [Line Items]
Increase in valuation allowance	$ 18,040,000
Deferred tax assets	0
Unrecognized Tax Benefits
Remaining unrecognized tax benefits	0
U.S. Federal
Tax Credit Carryforward [Line Items]
Federal net operating loss	30,888,000
U.S. Federal \| Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 3,468,000
U.S. Federal \| Research Tax Credit Carryforward \| Minimum
Tax Credit Carryforward [Line Items]
Tax credit carryforward, expiration year	2025
U.S. Federal \| Research Tax Credit Carryforward \| Maximum
Tax Credit Carryforward [Line Items]
Tax credit carryforward, expiration year	2036
New Jersey
Unrecognized Tax Benefits
Interest and penalties	$ 80,000	$ 61,000	$ 52,000
New Jersey \| Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 3,142,000
New Jersey \| Research Tax Credit Carryforward \| Minimum
Tax Credit Carryforward [Line Items]
Tax credit carryforward, expiration year	2018
New Jersey \| Research Tax Credit Carryforward \| Maximum
Tax Credit Carryforward [Line Items]
Tax credit carryforward, expiration year	2023

Income Taxes - Components of Income Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Domestic	$ (18,159)	$ (7,860)	$ (6,534)
Foreign	14,659	5,866	10,490
Income (loss) before income taxes	$ (3,500)	$ (1,994)	$ 3,956

Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Current:
Federal	$ (1,036)	$ 6,360	$ 4,983
State	(383)	(958)	1,076
Foreign	7,307	4,818	4,982
Deferred:
Federal	57,582	(11,520)	(9,137)
State	(4,601)	(80)	334
Foreign	(469)	(106)	(2)
Income tax expense (benefit)	$ 58,400	$ (1,486)	$ 2,236

Income Taxes - Reconciliation of Statutory Tax Rates and Effective Tax Rates (Detail)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax expense (benefit) rate	(31.60%)	(35.00%)	(35.00%)
State and local income tax expense, net of federal income tax effect	20.50%	2.90%	(5.20%)
Impact of limit on executive compensation	(0.00%)	(0.00%)	(0.00%)
Foreign earnings taxed at different rates	63.00%	131.50%	(31.70%)
Domestic permanent differences	65.60%	96.60%	(54.50%)
Foreign tax credits	(39.20%)	(67.70%)	25.20%
Research credits	(83.20%)	(163.20%)	65.90%
Tax reserves	(7.00%)	4.10%	(4.10%)
Valuation allowance	1626.50%	(31.80%)	(23.40%)
Statutory tax rate changes	451.90%	15.90%	9.40%
Stock-based compensation	(377.60%)	(0.00%)	(0.00%)
Other differences, net	(20.30%)	(27.80%)	(3.10%)
Effective income tax expense (benefit)	1668.60%	(74.50%)	(56.50%)

Income Taxes - Components of Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Deferred tax assets:
Net operating losses	$ 9,015	$ 0
Equity investment	1,162	0
Stock-based compensation	31,077	45,867
Deferred revenue	12,670	11,810
Tax credits	15,240	12,810
Accrued expenses	1,400	1,249
Allowance for doubtful accounts and other reserves	543	601
Less: valuation allowance	(58,350)	(1,796)
Total deferred tax assets	12,757	70,541
Deferred tax liabilities:
Depreciation and amortization	(6,172)	(9,523)
Deferred commissions	(9,015)	(10,790)
Total deferred tax liabilities	(15,187)	(20,313)
Net deferred tax liability	$ (2,430)	0
Net deferred tax asset		$ 50,228

Income Taxes - Schedule of Tax Years Subject to Income Tax Examination (Detail)	12 Months Ended
	Mar. 31, 2018
U.S. Federal \| Minimum
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2014
U.S. Federal \| Maximum
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2018
Foreign jurisdictions \| Minimum
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2013
Foreign jurisdictions \| Maximum
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2018

Income Taxes - Reconciliation of Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 2,098	$ 1,952	$ 2,005
Additions for tax positions related to current fiscal period	0	0	0
Additions for tax positions related to prior years	150	179	170
Settlements and effective settlements with tax authorities and remeasurements	0	0	(171)
Reductions related to the expiration of statutes of limitations	(397)	0	(64)
Foreign currency translation adjustment			12
Foreign currency translation adjustment	(111)	(33)
Ending balance	$ 1,740	$ 2,098	$ 1,952

Employee Benefit Plan - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Retirement Benefits [Abstract]
Company contributions to defined contribution plan	$ 2,959	$ 2,998	$ 2,047

Segment Information - Additional Information (Detail) - segment	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Number of reportable segments	1
Percentage of revenues below which countries other than the U.S. account for	10.00%	10.00%	10.00%
United States
Segment Reporting Information [Line Items]
Percentage of long-lived assets	10.00%	10.00%

Segment Information - Schedule of Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	$ 184,915	$ 180,366	$ 168,140	$ 165,972	$ 166,732	$ 167,061	$ 159,438	$ 151,774	$ 699,393	$ 645,005	$ 593,767
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues									377,934	365,354	341,822
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues									$ 321,459	$ 279,651	$ 251,945

Segment Information - Schedule of Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	$ 171,854	$ 139,592
United States
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	145,918	131,083
Other
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	$ 25,936	$ 8,509

Selected Quarterly Financial Data (unaudited) (Detail) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2018

Mar. 31, 2017

Mar. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Total revenue

$ 184,915

$ 180,366

$ 168,140

$ 165,972

$ 166,732

$ 167,061

$ 159,438

$ 151,774

$ 699,393

$ 645,005

$ 593,767

Gross margin

156,648

155,409

144,873

144,311

145,358

145,895

137,781

130,779

601,241

559,813

511,055

Net income (loss)

$ (1,661)

$ (58,945)

$ (1,010)

$ (284)

$ 197

$ 1,959

$ (54)

$ (2,610)

$ (61,900)

$ (508)

$ 1,720

Net income (loss) per common share:

Basic (in dollars per share)

$ (0.04)

^[1]

$ (1.30)

^[1]

$ (0.02)

^[1]

$ (0.01)

^[1]

$ 0.00

^[1]

$ 0.04

^[1]

$ 0.00

^[1]

$ (0.06)

^[1]

$ (1.37)

$ (0.01)

$ 0.04

Diluted (in dollars per share)

$ (0.04)

^[1]

$ (1.30)

^[1]

$ (0.02)

^[1]

$ (0.01)

^[1]

$ 0.00

^[1]

$ 0.04

^[1]

$ 0.00

^[1]

$ (0.06)

^[1]

$ (1.37)

$ (0.01)

$ 0.04

[1]	Per common share amounts for the quarters and full year have been calculated separately. Accordingly, quarterly amounts do not add to the annual amount because of differences in the weighted average common shares outstanding during each period used in the basic and diluted calculations.

Subsequent Event (Details) - Subsequent Event $ in Millions	May 01, 2018 USD ($) director
Subsequent Event [Line Items]
New independent directors appointed prior to annual meeting	2
Number of directors, board of directors	11
Operations Committee, Number Of Existing Board Directors	2
Operations Committee, Number Of New Directors	2
Percentage workforce reduced by	4.00%
Minimum
Subsequent Event [Line Items]
Pre-tax charges expected to incur \| $	$ 6
Maximum
Subsequent Event [Line Items]
Pre-tax charges expected to incur \| $	$ 8

Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 103	$ 315	$ 104
Charged (Credited) to Costs and Expenses	25	(161)	247
Deductions	24	51	36
Balance at End of Year	104	103	315
Valuation allowance for deferred taxes
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,796	2,772	1,343
Charged (Credited) to Costs and Expenses	56,554	(976)	1,429
Deductions	0	0	0
Balance at End of Year	$ 58,350	$ 1,796	$ 2,772