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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Oct. 29, 2018
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
Entity Emerging Growth Company	false
Entity Small Business	false
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		46,288,354

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 353,181	$ 330,784
Short-term investments	130,919	131,637
Trade accounts receivable	137,338	162,119
Other current assets	21,034	22,248
Total current assets	642,472	646,788
Property and equipment, net	126,292	128,612
Deferred commissions cost	32,290	33,092
Other assets	8,981	10,150
Total assets	810,035	818,642
Current liabilities:
Accounts payable	349	761
Accrued liabilities	71,431	82,299
Deferred revenue	223,192	241,113
Total current liabilities	294,972	324,173
Deferred revenue, less current portion	92,514	84,661
Deferred tax liabilities, net	2,304	2,430
Other liabilities	3,100	3,314
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value: 50,000 shares authorized, no shares issued and outstanding at September 30, 2018 and March 31, 2018	0	0
Common stock, $0.01 par value: 250,000 shares authorized, 46,034 shares and 45,118 shares issued and outstanding at September 30, 2018 and March 31, 2018, respectively	458	450
Additional paid-in capital	843,622	782,764
Accumulated deficit	(415,143)	(373,678)
Accumulated other comprehensive loss	(11,792)	(5,472)
Total stockholders’ equity	417,145	404,064
Total liabilities and stockholders’ equity	$ 810,035	$ 818,642

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2018	Mar. 31, 2018
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)	46,034,000	45,118,000
Common stock, shares outstanding (in shares)	46,034,000	45,118,000

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Total revenues	$ 169,078	$ 168,140	$ 345,255	$ 334,112
Cost of revenues:
Total cost of revenues	26,873	23,267	54,479	44,928
Gross margin	142,205	144,873	290,776	289,184
Operating expenses:
Sales and marketing	89,494	100,595	187,110	200,504
Research and development	24,507	22,925	49,301	45,470
General and administrative	24,004	23,620	46,546	47,471
Restructuring	494	0	8,389	0
Depreciation and amortization	2,700	2,388	5,233	4,755
Total operating expenses	141,199	149,528	296,579	298,200
Income (loss) from operations	1,006	(4,655)	(5,803)	(9,016)
Interest income	1,148	539	2,039	972
Interest expense	0	(234)	0	(466)
Equity in loss of affiliate	0	(162)	0	(123)
Income (loss) before income taxes	2,154	(4,512)	(3,764)	(8,633)
Income tax expense (benefit)	1,263	(3,502)	3,912	(7,339)
Net income (loss)	$ 891	$ (1,010)	$ (7,676)	$ (1,294)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.02	$ (0.02)	$ (0.17)	$ (0.03)
Diluted (in dollars per share)	$ 0.02	$ (0.02)	$ (0.17)	$ (0.03)
Weighted average common shares outstanding:
Basic (in shares)	45,880	45,598	45,666	45,364
Diluted (in shares)	47,798	45,598	45,666	45,364
Software and products
Revenues:
Total revenues	$ 69,504	$ 72,020	$ 144,554	$ 146,781
Cost of revenues:
Total cost of revenues	5,049	1,086	9,169	1,891
Services
Revenues:
Total revenues	99,574	96,120	200,701	187,331
Cost of revenues:
Total cost of revenues	$ 21,824	$ 22,181	$ 45,310	$ 43,037

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 891	$ (1,010)	$ (7,676)	$ (1,294)
Other comprehensive income (loss):
Foreign currency translation adjustment	(1,151)	1,569	(6,320)	4,620
Comprehensive income (loss)	$ (260)	$ 559	$ (13,996)	$ 3,326

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid – In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of Adoption of ASU 2016-09 \| Accounting Standards Update 2016-09 [Member]	$ 164		$ 435	$ (271)
Beginning balance (in shares) at Mar. 31, 2017		44,816
Beginning balance at Mar. 31, 2017	466,932	$ 447	694,477	(215,677)	$ (12,315)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	39,385		39,385
Share issuances related to stock-based compensation (in shares)		1,071
Share issuances related to stock-based compensation	16,735	$ 11	16,724
Repurchase of common stock (in shares)		(192)
Repurchase of common stock	(11,259)	$ (2)	(1,477)	(9,780)
Net income (loss)	(1,294)			(1,294)
Other comprehensive income (loss)	4,620				4,620
Ending balance (in shares) at Sep. 30, 2017		45,695
Ending balance at Sep. 30, 2017	515,283	$ 456	749,544	(227,022)	(7,695)
Beginning balance (in shares) at Jun. 30, 2017		45,354
Beginning balance at Jun. 30, 2017	494,997	$ 452	720,041	(216,232)	(9,264)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	19,821		19,821
Share issuances related to stock-based compensation (in shares)		533
Share issuances related to stock-based compensation	11,165	$ 6	11,159
Repurchase of common stock (in shares)		(192)
Repurchase of common stock	(11,259)	$ (2)	(1,477)	(9,780)
Net income (loss)	(1,010)			(1,010)
Other comprehensive income (loss)	1,569				1,569
Ending balance (in shares) at Sep. 30, 2017		45,695
Ending balance at Sep. 30, 2017	515,283	$ 456	749,544	(227,022)	(7,695)
Beginning balance (in shares) at Mar. 31, 2018		45,118
Beginning balance at Mar. 31, 2018	404,064	$ 450	782,764	(373,678)	(5,472)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	35,754		35,754
Share issuances related to stock-based compensation (in shares)		1,483
Share issuances related to stock-based compensation	29,626	$ 14	29,612
Repurchase of common stock (in shares)		(567)
Repurchase of common stock	(38,303)	$ (6)	(4,508)	(33,789)
Net income (loss)	(7,676)			(7,676)
Other comprehensive income (loss)	(6,320)				(6,320)
Ending balance (in shares) at Sep. 30, 2018		46,034
Ending balance at Sep. 30, 2018	417,145	$ 458	843,622	(415,143)	(11,792)
Beginning balance (in shares) at Jun. 30, 2018		45,580
Beginning balance at Jun. 30, 2018	396,715	$ 454	811,271	(404,369)	(10,641)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	17,750		17,750
Share issuances related to stock-based compensation (in shares)		655
Share issuances related to stock-based compensation	16,228	$ 6	16,222
Repurchase of common stock (in shares)		(201)
Repurchase of common stock	(13,288)	$ (2)	(1,621)	(11,665)
Net income (loss)	891			891
Other comprehensive income (loss)	(1,151)				(1,151)
Ending balance (in shares) at Sep. 30, 2018		46,034
Ending balance at Sep. 30, 2018	$ 417,145	$ 458	$ 843,622	$ (415,143)	$ (11,792)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net loss	$ (7,676)	$ (1,294)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	6,072	5,567
Noncash stock-based compensation	35,754	39,385
Deferred income taxes	(273)	(2,789)
Equity in loss of affiliate	0	123
Amortization of deferred commissions cost	8,916	8,339
Changes in operating assets and liabilities:
Trade accounts receivable	21,495	12,439
Other current assets and Other assets	4,884	(12,778)
Deferred commissions cost	(8,866)	(7,514)
Accounts payable	(382)	60
Accrued liabilities	(13,736)	(19,109)
Deferred revenue	(3,796)	7,413
Other liabilities	138	(224)
Net cash provided by operating activities	42,530	29,618
Cash flows from investing activities
Purchase of short-term investments	(65,519)	(77,174)
Proceeds from maturity of short-term investments	66,237	66,609
Purchase of property and equipment	(3,998)	(2,634)
Net cash used in investing activities	(3,280)	(13,199)
Cash flows from financing activities
Repurchase of common stock	(38,303)	(11,259)
Proceeds from stock-based compensation plans	29,626	16,735
Net cash provided by (used in) financing activities	(8,677)	5,476
Effects of exchange rate — changes in cash	(8,176)	11,945
Net increase in cash and cash equivalents	22,397	33,840
Cash and cash equivalents at beginning of period	330,784	329,491
Cash and cash equivalents at end of period	$ 353,181	$ 363,331

Basis of Presentation	6 Months Ended
Basis of Presentation	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation 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. The consolidated financial statements as of September 30, 2018 and for the three and six months ended September 30, 2018 and 2017 are unaudited, and in the opinion of management, include all adjustments (consisting only of normal recurring adjustments) necessary for a fair presentation of the results for the interim periods. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (“U.S. GAAP”) for complete financial statements and should be read in conjunction with the financial statements and notes in the Company’s Annual Report on Form 10-K for fiscal 2018. The results reported in these financial statements should not necessarily be taken as indicative of results that may be expected for the entire fiscal year. 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, income taxes and related reserves, stock-based compensation and accounting for research and development costs. Actual results could differ from those estimates.

Summary of Significant Accounting Policies

6 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

There have been no significant changes in the Company’s accounting policies during the six months ended September 30, 2018 as compared to the significant accounting policies described in its Annual Report on Form 10-K for the year ended March 31, 2018.

Recently Issued Accounting Standards

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 Company will adopt this ASU in fiscal 2020. The Company is currently assessing the impact of the adoption of ASU 2016-02 and expects to adopt the standard using the transition method in which prior period financial information is not adjusted.

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 36% of total revenues for both the six months ended September 30, 2018 and 2017, respectively. Arrow accounted for 28% of total accounts receivable as of September 30, 2018 and 38% of total accounts receivable as of March 31, 2018.

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. The Company’s cash equivalents balance consists primarily of money market funds. The Company’s short-term investments balance consists of U.S. Treasury Bills with maturities of one year or less. The Company accounts for its short-term investments as held to maturity.

The following table summarizes the composition of the Company’s financial assets measured at fair value at September 30, 2018 and March 31, 2018:



September 30, 2018	Level 1		Level 2	Level 3	Total
Cash equivalents	$	117,919	—	—	$	117,919
Short-term investments	$	—	131,929	—	$	131,929



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

Revenue

6 Months Ended

Sep. 30, 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.

Historically, 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.

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.



	Three Months Ended September 30, 2018
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	41,376	$	17,526	$	10,602	$	69,504
Customer Support Revenue	59,675		20,443		9,489		89,607
Professional Services	5,489		2,705		1,773		9,967
Total Revenue	$	106,540	$	40,674	$	21,864	$	169,078



	Three Months Ended September 30, 2017
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	40,704	$	21,049	$	10,267	$	72,020
Customer Support Revenue	58,205		18,625		8,947		85,777
Professional Services	5,965		2,759		1,619		10,343
Total Revenue	$	104,874	$	42,433	$	20,833	$	168,140



	Six Months Ended September 30, 2018
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	83,492	$	39,551	$	21,511	$	144,554
Customer Support Revenue	120,101		40,802		19,110		180,013
Professional Services	11,274		5,931		3,483		20,688
Total Revenue	$	214,867	$	86,284	$	44,104	$	345,255



	Six Months Ended September 30, 2017
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	80,715	$	44,821	$	21,245	$	146,781
Customer Support Revenue	114,394		35,736		17,537		167,667
Professional Services	10,826		5,304		3,534		19,664
Total Revenue	$	205,935	$	85,861	$	42,316	$	334,112

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 certain contracts the Company allows customers to pay for term-based, or subscription, software licenses and products over the term of the 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, 2018	$	152,219		$	9,900	$	4,380	$	241,113		$	84,661
Increase/(decrease), net	(27,200		)	2,419		343		(17,921		)	7,853
Ending Balance as of September 30, 2018	$	125,019		$	12,319	$	4,723	$	223,192		$	92,514

The decrease in accounts receivable is primarily a result of a decrease in software and products revenue relative to the fourth quarter of the prior year as well as a concentration of customer support renewals in the second half of the fiscal year. The decrease in deferred revenue is primarily the result of a decrease in deferred customer support revenue related to software and products revenue transactions and customer support renewals relative to the fourth quarter of fiscal 2018 and a strengthening of the U.S. dollar.

The amount of revenue recognized in fiscal 2019 that was included in the March 31, 2018 balance of deferred revenue was $66,993 and $157,230 for the three and six months ended September 30, 2018, respectively. 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 significant.

Remaining Performance Obligations

In addition to the amounts included in deferred revenue as of September 30, 2018, $23,043 of revenue may be recognized from remaining performance obligations, of which $1,513 was related to software and products. The Company expects the software and products revenue to be recognized next quarter. The vast 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.

Net Income per Common Share	6 Months Ended
Net Income per Common Share	Sep. 30, 2018
Earnings Per Share [Abstract]
Net Income per Common Share	Net Income per Common Share The diluted weighted average shares outstanding exclude outstanding stock options, restricted stock units, performance stock options, performance restricted stock units and shares to be purchased under the employee stock purchase plan totaling 1,024 and 7,433 for the three months ended September 30, 2018 and 2017, respectively, and 5,874 and 7,557 for the six months ended September 30, 2018 and 2017, respectively, because the effect would have been anti-dilutive.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In the normal course of its business, the Company may be involved in various claims, negotiations and legal actions. 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. Realtime has sued numerous other companies for infringement of these and other patents. Realtime seeks monetary damages and an injunction. On October 5, 2018, the Company reached an agreement which resulted in the dismissal with prejudice of Realtime’s claims, as well as Realtime’s claims against the Company’s customers, to the extent those claims are based on Commvault’s products. In connection with matter, the Company accrued $1,400 of General and administrative expense in the three and six months ended September 30, 2018. The Company has concluded that any loss related to this matter in excess of this accrual is remote. However, due to the inherent uncertainties of litigation, the Company cannot accurately predict the ultimate outcome of this matter.

Capitalization	6 Months Ended
Capitalization	Sep. 30, 2018
Equity [Abstract]
Capitalization	Capitalization On August 1, 2018 the Company's Board of Directors unanimously approved the termination of the Company’s rights agreement, which was originally scheduled to expire on November 14, 2018. The plan was amended to accelerate the expiration date to August 1, 2018, effectively terminating the plan as of that date. Subsequent Event On October 18, 2018, the Board of Directors extended the expiration date of the share repurchase program to March 31, 2020 and authorized an increase to the existing share repurchase program so that $200,000 was available.

Stock Plans

6 Months Ended

Sep. 30, 2018

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

Stock Plans

On August 23, 2018, the Company’s shareholders approved an amendment to the Omnibus Incentive Plan (the “2016 Incentive Plan”) to increase the maximum number of shares of common stock that may be delivered under plan to 5,550, an increase of 2,000 shares. The 2016 Incentive Plan authorizes a broad range of awards including stock options, stock appreciation rights, full value awards (including restricted stock, restricted stock units, performance shares or units and other stock-based awards) and cash-based awards.

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 and Restructuring for the three and six months ended September 30, 2018 and 2017. Stock-based compensation is attributable to stock options, restricted stock units, performance based awards and the employee stock purchase plan.



	Three Months Ended September 30,				Six Months Ended September 30,
	2018		2017		2018		2017
Cost of services revenue	$	756	$	751	$	1,512	$	1,502
Sales and marketing	9,071		8,984		18,595		18,424
Research and development	2,274		2,070		4,489		4,140
General and administrative	5,345		8,016		9,944		15,319
Restructuring	304		—		1,214		—
Stock-based compensation expense	$	17,750	$	19,821	$	35,754	$	39,385

As of September 30, 2018, there was $72,660 of unrecognized stock-based compensation expense related to non-vested stock option and restricted stock unit awards that is expected to be recognized over a weighted average period of 1.51 years. The Company accounts for forfeitures as they occur. To the extent that awards are forfeitured, stock-based compensation will be different from the Company’s current estimate.

Stock Options

Stock Option activity for the six months ended September 30, 2018 is as follows:



Options	Number of Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding as of March 31, 2018	4,402		$	48.64
Options granted	—		—
Options exercised	(724	)	33.69
Options forfeited	(9	)	45.47
Options expired	(60	)	78.89
Outstanding as of September 30, 2018	3,609		$	51.15	3.80	$	81,866
Exercisable as of September 30, 2018	3,543		$	51.28	3.76	$	80,158

The total intrinsic value of options exercised was $7,426 and $24,186 for the three and six months ended September 30, 2018 and $4,623 and $11,625 for the three and six months ended September 30, 2017. The Company’s policy is to issue new shares upon exercise of options as the Company does not hold shares in treasury.

Restricted Stock Units

Restricted stock unit activity for the six months ended September 30, 2018 is as follows:



Non-vested Restricted Stock Units	Number of Awards		Weighted Average Grant Date Fair Value
Non-vested as of March 31, 2018	2,166		$	54.13
Awarded	397		71.11
Vested	(643	)	50.90
Forfeited	(164	)	56.69
Non-vested as of September 30, 2018	1,756		$	58.89

The weighted average fair value of restricted stock units awarded was $67.41 and $71.11 per unit during the three and six months ended September 30, 2018, and $59.29 and $60.01 per unit during the three and six months ended September 30, 2017. The weighted average fair value of awards includes the awards with a market condition described below.

Performance Based Awards

In the six months ended September 30, 2018, the Company granted 72 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 2019 and ii) the Company's customary service periods. The awards vest over three years and have a maximum potential to vest at 200% (144 shares) based on actual fiscal 2019 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 the interim financial periods, management estimates the probable number of PSU’s that would vest until the ultimate achievement of the performance goals is known. The awards are included in the restricted stock unit table.

Awards with a Market Condition

In the six months ended September 30, 2018, the Company granted 75 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 the Russell 3000 market index over the next three years. The awards vest in three annual tranches and have a maximum potential to vest at 200% (150 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 fair value of the awards granted during the six months ended September 30, 2018 was $81.78. The awards are included in the restricted stock unit table.

Income Taxes	6 Months Ended
Income Taxes	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense was $3,912 in the six months ended September 30, 2018 compared to a benefit of $7,339 in the six months ended September 30, 2017. In third quarter of fiscal 2018 the Company determined that it was more likely than not that it will not realize the benefits of its gross deferred tax assets and therefore 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 tax expense for the six months ended September 30, 2018 relates primarily to current foreign taxes. Impact of U.S. Tax Reform The Tax Cuts and Jobs Act (the "Act") was enacted on December 22, 2017. The Act reduces the US 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 September 30, 2018, the Company has not fully completed the accounting for the tax effects of enactment of the Act; however, 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 the 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. Based on analysis completed to date the one-time transition tax is expected to be zero. In addition, as of September 30, 2018, the Company no longer considers the undistributed earnings held outside of the U.S. by most of its foreign subsidiaries to be indefinitely reinvested. The Company still considers undistributed earnings held in China and India to be permanently reinvested. The Company also continues to evaluate the impact of the GILTI provisions under the Act which are complex and subject to continuing regulatory interpretation by the U.S. Internal Revenue Service (IRS). The Company is required to make an accounting policy election of either (1) treating taxes due on future U.S. inclusions in taxable income related to GILTI as a current period expense when incurred (the “period cost method”) or (2) factoring such amounts into the Company’s measurement of its deferred taxes (the “deferred method”). The Company’s accounting policy election with respect to the new GILTI Tax rules will depend, in part, on analyzing its global income to determine whether it can reasonably estimate the tax impact. While the Company has included an estimate of GILTI in its estimated effective tax rate for fiscal 2019, it has not completed its analysis and has not determined which method to elect. Adjustments related to the amount of GILTI recorded in the financial statements may be required based on the outcome of this election. However, there is no impact on tax expense in the six months ended September 30, 2018 due to the valuation allowance recorded against deferred tax assets. The Act also requires other 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 IRS, and other standard-setting bodies could interpret or issue guidance on how provisions of the Act will be applied or otherwise administered that is different from our current interpretation.

Restructuring

6 Months Ended

Sep. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring

In fiscal 2019, the Company initiated a restructuring plan to increase efficiency in its sales, marketing and distribution functions as well as reduce costs across all functional areas. During the six months ended September 30, 2018, the Company incurred total restructuring charges of $8,389. These restructuring charges relate primarily to severance and related costs associated with headcount reductions. These charges include $1,214 of stock-based compensation related to modifications of existing unvested awards granted to certain employees impacted by the restructuring plan.

The activity in the Company’s restructuring accruals for the six months ended June 30, 2018 is summarized as follows:



	Total
Balance at March 31, 2018	$	—
Restructuring charges	8,389
Payments	(6,626		)
Balance at September 30, 2018	$	1,763

As of September 30, 2018, the outstanding restructuring accruals primarily relate to future severance payments.

Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	The consolidated financial statements as of September 30, 2018 and for the three and six months ended September 30, 2018 and 2017 are unaudited, and in the opinion of management, include all adjustments (consisting only of normal recurring adjustments) necessary for a fair presentation of the results for the interim periods. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (“U.S. GAAP”) for complete financial statements and should be read in conjunction with the financial statements and notes in the Company’s Annual Report on Form 10-K for fiscal 2018. The results reported in these financial statements should not necessarily be taken as indicative of results that may be expected for the entire fiscal year.
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, income taxes and related reserves, stock-based compensation and accounting for research and development costs. Actual results could differ from those estimates.
Recently Issued Accounting Standards	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 Company will adopt this ASU in fiscal 2020. The Company is currently assessing the impact of the adoption of ASU 2016-02 and expects to adopt the standard using the transition method in which prior period financial information is not adjusted.
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	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. The Company’s cash equivalents balance consists primarily of money market funds. The Company’s short-term investments balance consists of U.S. Treasury Bills with maturities of one year or less. The Company accounts for its short-term investments as held to maturity.
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. Historically, 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. 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.

Summary of Significant Accounting Policies (Tables)

6 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Financial Assets Measured at Fair Value

The following table summarizes the composition of the Company’s financial assets measured at fair value at September 30, 2018 and March 31, 2018:



September 30, 2018	Level 1		Level 2	Level 3	Total
Cash equivalents	$	117,919	—	—	$	117,919
Short-term investments	$	—	131,929	—	$	131,929



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

Revenue (Tables)

6 Months Ended

Sep. 30, 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



	Three Months Ended September 30, 2018
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	41,376	$	17,526	$	10,602	$	69,504
Customer Support Revenue	59,675		20,443		9,489		89,607
Professional Services	5,489		2,705		1,773		9,967
Total Revenue	$	106,540	$	40,674	$	21,864	$	169,078



	Three Months Ended September 30, 2017
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	40,704	$	21,049	$	10,267	$	72,020
Customer Support Revenue	58,205		18,625		8,947		85,777
Professional Services	5,965		2,759		1,619		10,343
Total Revenue	$	104,874	$	42,433	$	20,833	$	168,140



	Six Months Ended September 30, 2018
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	83,492	$	39,551	$	21,511	$	144,554
Customer Support Revenue	120,101		40,802		19,110		180,013
Professional Services	11,274		5,931		3,483		20,688
Total Revenue	$	214,867	$	86,284	$	44,104	$	345,255



	Six Months Ended September 30, 2017
	Americas		EMEA		APAC		Total
Software and Products Revenue	$	80,715	$	44,821	$	21,245	$	146,781
Customer Support Revenue	114,394		35,736		17,537		167,667
Professional Services	10,826		5,304		3,534		19,664
Total Revenue	$	205,935	$	85,861	$	42,316	$	334,112

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, 2018	$	152,219		$	9,900	$	4,380	$	241,113		$	84,661
Increase/(decrease), net	(27,200		)	2,419		343		(17,921		)	7,853
Ending Balance as of September 30, 2018	$	125,019		$	12,319	$	4,723	$	223,192		$	92,514

Stock Plans (Tables)

6 Months Ended

Sep. 30, 2018

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

Stock-Based Compensation Expense



	Three Months Ended September 30,				Six Months Ended September 30,
	2018		2017		2018		2017
Cost of services revenue	$	756	$	751	$	1,512	$	1,502
Sales and marketing	9,071		8,984		18,595		18,424
Research and development	2,274		2,070		4,489		4,140
General and administrative	5,345		8,016		9,944		15,319
Restructuring	304		—		1,214		—
Stock-based compensation expense	$	17,750	$	19,821	$	35,754	$	39,385

Schedule of Stock Option Activity

Stock Option activity for the six months ended September 30, 2018 is as follows:



Options	Number of Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding as of March 31, 2018	4,402		$	48.64
Options granted	—		—
Options exercised	(724	)	33.69
Options forfeited	(9	)	45.47
Options expired	(60	)	78.89
Outstanding as of September 30, 2018	3,609		$	51.15	3.80	$	81,866
Exercisable as of September 30, 2018	3,543		$	51.28	3.76	$	80,158

Schedule of Restricted Stock Unit Activity

Restricted stock unit activity for the six months ended September 30, 2018 is as follows:



Non-vested Restricted Stock Units	Number of Awards		Weighted Average Grant Date Fair Value
Non-vested as of March 31, 2018	2,166		$	54.13
Awarded	397		71.11
Vested	(643	)	50.90
Forfeited	(164	)	56.69
Non-vested as of September 30, 2018	1,756		$	58.89

Restructuring (Tables)

6 Months Ended

Sep. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring and Related Costs

The activity in the Company’s restructuring accruals for the six months ended June 30, 2018 is summarized as follows:



	Total
Balance at March 31, 2018	$	—
Restructuring charges	8,389
Payments	(6,626		)
Balance at September 30, 2018	$	1,763

Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - Customer Concentration Risk - Arrow	6 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
Revenue
Concentration Risk [Line Items]
Concentration risk percentage	36.00%	36.00%
Accounts receivable
Concentration Risk [Line Items]
Concentration risk percentage	28.00%		38.00%

Summary of Significant Accounting Policies - Summary of Fair Value of Financial Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 117,919	$ 43,545
Short-term investments	131,929	132,263
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	117,919	43,545
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	131,929	132,263
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	$ 0	$ 0

Revenue - Additional Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
Revenue - Additional Information (Details) $ in Thousands	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($) revenue_source segment
Revenue from Contract with Customer [Abstract]
Sources of primary revenue \| revenue_source		2
Customer support agreement term		1 year
Number of operating segments \| segment		1
Revenue recognized in period, included in opening deferred revenue balance	$ 66,993	$ 157,230
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized from remaining performance obligations	23,043	23,043
Software and Products Revenue
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized from remaining performance obligations	$ 1,513	$ 1,513

Revenue - Performance Obligations (Details)	6 Months Ended
Revenue - Performance Obligations (Details)	Sep. 30, 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	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 169,078	$ 168,140	$ 345,255	$ 334,112
Americas
Disaggregation of Revenue [Line Items]
Total revenues	106,540	104,874	214,867	205,935
EMEA
Disaggregation of Revenue [Line Items]
Total revenues	40,674	42,433	86,284	85,861
APAC
Disaggregation of Revenue [Line Items]
Total revenues	21,864	20,833	44,104	42,316
Software and Products Revenue
Disaggregation of Revenue [Line Items]
Total revenues	69,504	72,020	144,554	146,781
Software and Products Revenue \| Americas
Disaggregation of Revenue [Line Items]
Total revenues	41,376	40,704	83,492	80,715
Software and Products Revenue \| EMEA
Disaggregation of Revenue [Line Items]
Total revenues	17,526	21,049	39,551	44,821
Software and Products Revenue \| APAC
Disaggregation of Revenue [Line Items]
Total revenues	10,602	10,267	21,511	21,245
Customer Support Revenue
Disaggregation of Revenue [Line Items]
Total revenues	89,607	85,777	180,013	167,667
Customer Support Revenue \| Americas
Disaggregation of Revenue [Line Items]
Total revenues	59,675	58,205	120,101	114,394
Customer Support Revenue \| EMEA
Disaggregation of Revenue [Line Items]
Total revenues	20,443	18,625	40,802	35,736
Customer Support Revenue \| APAC
Disaggregation of Revenue [Line Items]
Total revenues	9,489	8,947	19,110	17,537
Professional Services
Disaggregation of Revenue [Line Items]
Total revenues	9,967	10,343	20,688	19,664
Professional Services \| Americas
Disaggregation of Revenue [Line Items]
Total revenues	5,489	5,965	11,274	10,826
Professional Services \| EMEA
Disaggregation of Revenue [Line Items]
Total revenues	2,705	2,759	5,931	5,304
Professional Services \| APAC
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,773	$ 1,619	$ 3,483	$ 3,534

Revenue - Opening and Closing Balances of Accounts Receivable, Unbilled Receivables, and Deferred Revenues (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2018 USD ($)
Accounts Receivable [Roll Forward]
Opening Balance as of March 31, 2018	$ 152,219
Increase/(decrease), net	(27,200)
Ending Balance as of September 30, 2018	125,019
Unbilled Receivable (current) [Roll Forward]
Opening Balance as of March 31, 2018	9,900
Increase/(decrease), net	2,419
Ending Balance as of September 30, 2018	12,319
Unbilled Receivable (long-term) [Roll Forward]
Opening Balance as of March 31, 2018	4,380
Increase/(decrease), net	343
Ending Balance as of September 30, 2018	4,723
Deferred Revenue (current) [Roll Forward]
Opening Balance as of March 31, 2018	241,113
Increase/(decrease), net	(17,921)
Ending Balance as of September 30, 2018	223,192
Deferred Revenue (long-term) [Roll Forward]
Opening Balance as of March 31, 2018	84,661
Increase/(decrease), net	7,853
Ending Balance as of September 30, 2018	$ 92,514

Net Income per Common Share - Additional Information (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation (in shares)	1,024	7,433	5,874	7,557

Commitments and Contingencies - Additional Information (Details) - Realtime - Pending $ in Thousands		3 Months Ended	6 Months Ended
	Feb. 27, 2017 patent	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Loss Contingencies [Line Items]
Number of patents involved in alleged infringement \| patent	4
General and administrative expense accrued in connection to litigation settlement \| $		$ 1,400	$ 1,400

Capitalization - Additional Information (Details)	Oct. 18, 2018 USD ($)
Common stock repurchase program \| Subsequent Event
Class of Stock [Line Items]
Authorized amount available under share repurchase program	$ 200,000,000

Stock Plans - Additional Information (Details) - USD ($) $ in Thousands		6 Months Ended
	Aug. 23, 2018	Sep. 30, 2018
Stock options and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense, net of estimated forfeitures		$ 72,660
Weighted average period awards are expected to be recognized		1 year 6 months 3 days
2016 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock that may be delivered under plan (in shares)	5,550,000
Addition shares authorized (in shares)	2,000,000

Stock Plans - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 17,750	$ 19,821	$ 35,754	$ 39,385
Cost of services revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	756	751	1,512	1,502
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	9,071	8,984	18,595	18,424
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,274	2,070	4,489	4,140
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	5,345	8,016	9,944	15,319
Restructuring
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 304	$ 0	$ 1,214	$ 0

Stock Plans - Activity for Company's Two Stock Incentive Plans (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Sep. 30, 2018 USD ($) $ / shares shares
Number of Options
Outstanding (in shares) as of March 31, 2018 \| shares	4,402
Options granted (in shares) \| shares	0
Options exercised (in shares) \| shares	(724)
Options forfeited (in shares) \| shares	(9)
Options expired (in shares) \| shares	(60)
Outstanding (in shares) as of September 30, 2018 \| shares	3,609
Exercisable (in shares) as of September 30, 2018 \| shares	3,543
Weighted- Average Exercise Price
Outstanding (in dollars per share) as of March 31, 2018 \| $ / shares	$ 48.64
Options granted (in dollars per share) \| $ / shares	0.00
Options exercised (in dollars per share) \| $ / shares	33.69
Options forfeited (in dollars per share) \| $ / shares	45.47
Options expired (in dollars per share) \| $ / shares	78.89
Outstanding (in dollars per share) as of September 30, 2018 \| $ / shares	51.15
Exercisable (in dollars per share) as of September 30, 2018 \| $ / shares	$ 51.28
Weighted- Average Remaining Contractual Term (Years)
Outstanding (in years) as of September 30, 2018	3 years 9 months 18 days
Exercisable (in years) as of September 30, 2018	3 years 9 months 3 days
Aggregate Intrinsic Value
Outstanding as of September 30, 2018 \| $	$ 81,866
Exercisable as of September 30, 2018 \| $	$ 80,158

Stock Plans - Stock Options Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total intrinsic value of options exercised	$ 7,426	$ 4,623	$ 24,186	$ 11,625

Stock Plans - Restricted Stock Unit Activity (Details) - Restricted stock units - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Number of Awards
Non-vested (in shares) as of March 31, 2018			2,166
Awarded (in shares)			397
Vested (in shares)			(643)
Forfeited (in shares)			(164)
Non-vested (in shares) as of September 30, 2018	1,756		1,756
Weighted Average Grant Date Fair Value
Non-vested (in dollars per share) as of March 31, 2018			$ 54.13
Awarded (in dollars per share)	$ 67.41	$ 59.29	71.11	$ 60.01
Vested (in dollars per share)			50.90
Forfeited (in dollars per share)			56.69
Non-vested (in dollars per share) as of September 30, 2018	$ 58.89		$ 58.89

Stock Plans - Restricted Stock Units Additional Information (Details) - $ / shares	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, units awarded (in dollars per share)	$ 67.41	$ 59.29	$ 71.11	$ 60.01

Stock Plans - Performance-based and Market-based Awards (Details) shares in Thousands	6 Months Ended
	Sep. 30, 2018 tranche $ / shares shares
PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)	72
Service period	3 years
Maximum potential to vest (as a percentage)	200.00%
Maximum potential to vest (in shares)	144
Market performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awarded (in shares)	75
Service period	3 years
Number of annual tranches \| tranche	3
Maximum potential to vest (as a percentage)	200.00%
Maximum potential to vest (in shares)	150
Weighted average fair value, units awarded (in dollars per share) \| $ / shares	$ 81.78

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 1,263,000	$ (3,502,000)	$ 3,912,000	$ (7,339,000)
Deferred tax assets	$ 0		0
Tax cuts and jobs act, transition tax			$ 0

Restructuring - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 494	$ 0	$ 8,389	$ 0
Stock-Based Compensation
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 1,214

Restructuring - Restructuring Accruals (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Reserve [Roll Forward]
Balance at March 31, 2018			$ 0
Restructuring charges	$ 494	$ 0	8,389	$ 0
Payments			(6,626)
Balance at September 30, 2018	$ 1,763		$ 1,763