Commvault Systems (CVLT) 10-K 8 May 15 2015 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Mar. 31, 2015	1-May-15	Sep. 30, 2014
Document And Entity Information [Abstract]
Trading Symbol	CVLT
Entity Registrant Name	COMMVAULT SYSTEMS INC
Entity Central Index Key	1169561
Current Fiscal Year End Date	-28
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		45,230,578
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$2.10

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$337,673	$457,733
Short-term investments	49,936	24,976
Trade accounts receivable, less allowance for doubtful accounts of $104 and $111 at March 31, 2015 and 2014, respectively	117,716	118,527
Prepaid expenses and other current assets	20,084	11,329
Deferred tax assets, net	16,142	17,966
Total current assets	541,551	630,531
Deferred tax assets, net	24,903	28,737
Property and equipment, net	140,208	88,901
Other assets	6,804	7,215
Total assets	713,466	755,384
Current Liabilities:
Accounts payable	860	1,218
Accrued liabilities	72,757	76,166
Deferred revenue	184,312	166,143
Total current liabilities	257,929	243,527
Deferred revenue, less current portion	45,423	43,432
Other liabilities	3,104	5,847
Commitments and contingencies (Note 5)
Stockholders’ equity:
Preferred stock, $0.01 par value: 50,000 shares authorized, no shares issued and outstanding at March 31, 2015 and 2014	0	0
Common stock, $0.01 par value, 250,000 shares authorized, 45,122 shares and 47,094 shares issued and outstanding at March 31, 2015 and 2014, respectively	451	471
Additional paid-in capital	539,565	481,083
Accumulated deficit	-125,502	-18,059
Accumulated other comprehensive loss	-7,504	-917
Total stockholders’ equity	407,010	462,578
Total liabilities and stockholders’ equity	$713,466	$755,384

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Allowance for doubtful trade accounts receivable	$104	$111
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	45,122,000	47,094,000
Common stock, shares outstanding	45,122,000	47,094,000

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Software	$283,254	$294,411	$251,508
Services	324,289	291,929	244,342
Total revenues	607,543	586,340	495,850
Cost of revenues:
Software	2,442	2,588	2,863
Services	79,626	71,713	62,089
Total cost of revenues	82,068	74,301	64,952
Gross margin	525,475	512,039	430,898
Operating expenses:
Sales and marketing	335,980	283,304	247,696
Research and development	64,143	55,134	47,356
General and administrative	78,063	67,106	50,119
Depreciation and amortization	8,505	6,075	4,832
Total operating expenses	486,691	411,619	350,003
Income from operations	38,784	100,420	80,895
Interest expense	-665	0	0
Interest income	773	890	1,059
Income before income taxes	38,892	101,310	81,954
Income tax expense	13,242	37,246	28,745
Net income	$25,650	$64,064	$53,209
Net income per common share:
Basic (in dollars per share)	$0.56	$1.36	$1.17
Diluted (in dollars per share)	$0.54	$1.29	$1.10
Weighted average common shares outstanding:
Basic (in shares)	45,464	46,976	45,463
Diluted (in shares)	47,222	49,642	48,330

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$25,650	$64,064	$53,209
Other comprehensive loss:
Foreign currency translation adjustment	-6,587	-628	-528
Comprehensive income	$19,063	$63,436	$52,681

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
In Thousands, unless otherwise specified
Beginning Balance at Mar. 31, 2012	$229,984	$446	$320,438	($91,139)	$239
Beginning Balance (in shares) at Mar. 31, 2012		44,594
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	30,098		30,098
Tax benefits relating to share-based payments	23,126		23,126
Share issuances related to stock-based payments (in shares)		1,803
Share issuances related to stock-based payments	18,128	18	18,110
Repurchase of common stock (in shares)
Repurchase of common stock	0
Net income	53,209			53,209
Other comprehensive income (loss)	-528				-528
Ending Balance at Mar. 31, 2013	354,017	464	391,772	-37,930	-289
Ending Balance (in shares) at Mar. 31, 2013		46,397
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	49,124		49,124
Tax benefits relating to share-based payments	28,416		28,416
Share issuances related to stock-based payments (in shares)		1,472
Share issuances related to stock-based payments	17,615	15	17,600
Repurchase of common stock (in shares)		-775
Repurchase of common stock	-50,030	-8	-5,829	-44,193
Net income	64,064			64,064
Other comprehensive income (loss)	-628				-628
Ending Balance at Mar. 31, 2014	462,578	471	481,083	-18,059	-917
Ending Balance (in shares) at Mar. 31, 2014		47,094
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	60,663		60,663
Tax benefits relating to share-based payments	2,141		2,141
Share issuances related to stock-based payments (in shares)		1,199
Share issuances related to stock-based payments	17,690	12	17,678
Repurchase of common stock (in shares)		-3,171
Repurchase of common stock	-155,125	-32	-22,000	-133,093
Net income	25,650			25,650
Other comprehensive income (loss)	-6,587				-6,587
Ending Balance at Mar. 31, 2015	$407,010	$451	$539,565	($125,502)	($7,504)
Ending Balance (in shares) at Mar. 31, 2015		45,122

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net income	$25,650	$64,064	$53,209
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,046	6,207	4,939
Noncash stock-based compensation	60,663	49,124	30,098
Excess tax benefits from stock-based compensation	-5,057	-28,337	-23,080
Deferred income taxes	4,072	-6,430	-2,094
Changes in operating assets and liabilities:
Trade accounts receivable	-6,581	-33,482	-17,939
Prepaid expenses and other current assets	-11,907	3,948	-2,684
Other assets	1,229	-160	-1,844
Accounts payable	-267	-2,695	2,036
Accrued liabilities	13,221	43,187	32,358
Deferred revenue	35,818	25,156	38,041
Other liabilities	-2,040	-1,445	-357
Net cash provided by operating activities	123,847	119,137	112,683
Cash flows from investing activities
Purchase of short-term investments	-68,933	-28,976	-1,948
Proceeds from maturity of short-term investments	43,973	5,948	3,146
Purchases for corporate campus headquarters	-59,297	-62,214	-9,209
Purchase of property and equipment	-5,784	-4,916	-7,821
Net cash used in investing activities	-90,041	-90,158	-15,832
Cash flows from financing activities
Repurchase of common stock	-155,125	-50,030	0
Debt issuance costs	-1,262	0	0
Proceeds from the exercise of stock options and the Employee Stock Purchase Plan	17,690	17,615	18,128
Excess tax benefits from stock-based compensation	5,057	28,337	23,080
Net cash provided by (used in) financing activities	-133,640	-4,078	41,208
Effects of exchange rate — changes in cash	-20,226	-1,132	-1,183
Net increase (decrease) in cash and cash equivalents	-120,060	23,769	136,876
Cash and cash equivalents at beginning of year	457,733	433,964	297,088
Cash and cash equivalents at end of year	337,673	457,733	433,964
Supplemental disclosures of cash flow information
Interest paid	475	0	0
Income taxes paid	15,590	12,442	5,612
Purchases for corporate campus headquarters in accounts payable and accrued liabilities	$2,111	$6,805	$953

Nature_of_Business

Nature of Business	12 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Nature of Business	Nature of Business
	CommVault Systems, Inc. and its subsidiaries (“CommVault” or the “Company”) is a leading 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 high-performance data protection, including backup and recovery; data migration and archiving; snapshot management and replication of data; integrated source, and target data deduplication; eDiscovery and compliance solutions; self-service access; a secure virtual repository using Simpana ContentStore; enterprise-wide search capabilities; protection, recovery and discovery of data in virtual server and cloud environments; and robust built-in analytics and troubleshooting tools. The Company’s unified suite of data and information management software applications, which is sold under the Simpana brand, shares an underlying architecture that has been developed to minimize the cost and complexity of managing data on globally distributed and networked storage infrastructures. The Company also provides its customers with a broad range of professional and customer support services.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	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, income taxes and related reserves, stock-based compensation and accounting for research and development costs. Actual results could differ from those estimates.
	Revenue Recognition
	The Company derives revenues from two primary sources: software licenses and services. Services include customer support, consulting, assessment and design services, installation services and training. A typical sales arrangement includes both licenses and services.
	For sales arrangements involving multiple elements, the Company recognizes revenue using the residual method. Under the residual method, the Company allocates and defers revenue for the undelivered elements based on fair value and recognizes the difference between the total arrangement fee and the amount deferred for the undelivered elements as revenue. The determination of fair value of the undelivered elements in multiple-element arrangements is based on the price charged when such elements are sold separately, which is commonly referred to as vendor-specific objective-evidence, or VSOE.
	The Company’s software licenses typically provide for a perpetual right to use the Company’s software and are sold on a per terabyte capacity basis, on a per-copy basis, as site licenses or as a solution set. Software licenses sold on a capacity basis provide the customer with unlimited licenses of specified software products based on a defined level of terabytes of data under management. Site licenses give the customer the additional right to deploy the software on a limited basis during a specified term. Solution sets are generally sold on a per unit basis such as per virtual machine for our virtual machine backup, recovery and cloud management solution set; per mailbox for our email archive solution set and per user for our endpoint data protection solution set.
	The Company recognizes software revenue through direct sales channels upon receipt of a purchase order or other persuasive evidence and when all other basic revenue recognition criteria are met as described below. The Company recognizes software revenue through all indirect sales channels on a sell-through model. A sell-through model requires that the Company recognize revenue when the basic revenue recognition criteria are met as described below and these channels complete the sale of the Company’s software products to the end-user. Revenue from software licenses sold through an original equipment manufacturer partner is recognized upon the receipt of a royalty report or purchase order from that original equipment manufacturer partner.
	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. Customer support revenue is recognized ratably over the term of the customer support agreement, which is typically one year. To determine the price for the customer support element when sold separately, the Company primarily uses historical renewal rates. Historical renewal rates are supported by performing an analysis in which the Company segregates its customer support renewal contracts into different classes based on specific criteria including, but not limited to, the dollar amount of the software purchased, the level of customer support being provided and the distribution channel. As a result of this analysis, the Company has concluded that it has established VSOE for the different classes of customer support when the support is sold as part of a multiple-element sales arrangement. The Company’s determination of fair value for customer support has not changed for the periods presented.
	The Company’s other professional services include consulting services, implementation and post-deployment services and education services. Other professional services provided by the Company are not mandatory and can also be performed by the customer or a third-party. In addition to a signed purchase order, the Company’s consulting services and implementation and post-deployment services are, in some cases, evidenced by a Statement of Work, which defines the specific scope of such services to be performed when sold and performed on a stand-alone basis or included in multiple-element sales arrangements. Revenues from consulting services and implementation and post-deployment services are based upon a daily or weekly rate and are recognized when the services are completed. Education services include courses taught by the Company’s instructors or third-party contractors either at one of the Company’s facilities or at the customer’s site. Education services fees are recognized as revenue after the course has been provided. Based on the Company’s analysis of such other professional services transactions sold on a stand-alone basis, the Company has concluded it has established VSOE for such other professional services when sold in connection with a multiple-element sales arrangement. The Company generally performs its other professional services within 90 days of entering into an agreement. The Company’s determination of fair value for other professional services has not changed for the periods presented.
	The Company has analyzed all of the undelivered elements included in its multiple-element sales arrangements and determined that VSOE of fair value exists to allocate revenues to services. Accordingly, assuming all basic revenue recognition criteria are met, software revenue is recognized upon delivery of the software license using the residual method.
	The Company considers the four basic revenue recognition criteria for each of the elements as follows:
	•	Persuasive evidence of an arrangement with the customer exists.    The Company’s customary practice is to require a purchase order and, in some cases, a written contract signed by both the customer and the Company, or other persuasive evidence that an arrangement exists prior to recognizing revenue related to an arrangement.
	•	Delivery or performance has occurred.    The Company’s software applications are either physically or electronically delivered to customers with standard transfer terms such as FOB shipping point. Software and/or software license keys for add-on orders or software updates are typically delivered in an electronic format. If products that are essential to the functionality of the delivered software in an arrangement have not been delivered, the Company does not consider delivery to have occurred. Services revenue is recognized when the services are completed, except for customer support, which is recognized ratably over the term of the customer support agreement, which is typically one year.
	•	Vendor’s fee is fixed or determinable.    The fee customers pay for software applications, customer support and other professional services is negotiated at the outset of a sales arrangement. The fees are therefore considered to be fixed or determinable at the inception of the arrangement. The Company evaluates instances when extended payment terms are granted to determine if revenue should be deferred until payment becomes due.
	•	Collection is probable.     Probability of collection is assessed on a customer-by-customer basis. Each new customer undergoes a credit review process to evaluate its financial position and ability to pay. If the Company determines from the outset of an arrangement that collection is not probable based upon the review process, revenue is recognized at the earlier of when cash is collected or when sufficient credit becomes available, assuming all of the other basic revenue recognition criteria are met.
	The Company’s sales arrangements generally do not include acceptance clauses. However, if an arrangement does include an acceptance clause, revenue for such an arrangement is deferred and recognized upon acceptance. Acceptance occurs upon the earliest of receipt of a written customer acceptance, waiver of customer acceptance or expiration of the acceptance period.
	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 basic and diluted net income per common share:
			Year Ended March 31,
			2015			2014			2013
	Net income		$	25,650		$	64,064		$	53,209
	Basic net income per common share:
	Basic weighted average shares outstanding		45,464			46,976			45,463
	Basic net income per common share		$	0.56		$	1.36		$	1.17
	Diluted net income per common share:
	Basic weighted average shares outstanding		45,464			46,976			45,463
	Dilutive effect of stock options, restricted stock units, and employee stock purchase plan		1,758			2,666			2,867
	Diluted weighted average shares outstanding		47,222			49,642			48,330
	Diluted net income per common share		$	0.54		$	1.29		$	1.1
	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,
			2015		2014			2013
	Stock options, restricted stock units, and shares under the employee stock purchase plan		3,136		964			554
	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.
	Accounts Receivable and Allowance for Doubtful Accounts
	Accounts receivable consist of amounts due to the Company from normal business activities. The Company maintains an allowance for estimated losses resulting from the inability of its customers to make required payments. The Company estimates uncollectible amounts based upon historical bad debts, evaluation of current customer receivable balances, age of customer receivable balances, the customer’s financial condition and current economic trends.
	Accounting for Income Taxes
	As part of the process of preparing financial statements, the Company is required to estimate its income taxes in each of the jurisdictions in which it operates. This process involves estimating actual current tax exposure, including assessing the risks associated with tax audits, and assessing temporary differences resulting from different treatment of items for tax and accounting purposes. These differences result in deferred tax assets and liabilities. As of March 31, 2015, the Company had net deferred tax assets of approximately $41,045, which were primarily related to stock-based compensation, deferred revenue, and federal and state research tax credit carryforwards. The Company assesses the likelihood that its deferred tax assets will be recovered from future taxable income, and to the extent that the Company believes recovery is not likely, the Company establishes a valuation allowance. As of March 31, 2015, the Company maintains a valuation allowance against its deferred tax assets totaling $1,343 primarily related to the uncertainty of the Company’s ability to utilize New Jersey state research tax credits before they expire. The Company based its valuation allowance on its estimates of taxable income by legal entity and the period over which its state research tax credits will be recoverable.
	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. The Company applies the guidance issued to address the accounting for uncertain tax positions. This guidance clarifies the accounting for income taxes, by prescribing a minimum recognition threshold a tax position is required to meet before being recognized in the financial statements as well as provides guidance on derecognition, measurement, classification, interest and penalties, accounting in interim periods, disclosure and transition.
	As of March 31, 2015, the Company had unrecognized tax benefits of $2,005, all of which, if recognized, would favorably affect the effective tax rate. In addition, the Company had accrued interest and penalties of $401 related to the unrecognized tax benefits. Interest and penalties, if any, related to unrecognized tax benefits are recorded in income tax expense. Components of the reserve are classified as either current or long-term in the Consolidated Balance Sheet based on when we expect each of the items to be settled. However, unrecognized tax benefits which are related to a Deferred Tax Asset recorded in the Consolidated Balance Sheet are presented as a reduction against the related Deferred Tax Asset.
	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, 2015, 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 Income. 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%, 31% and 29% of total revenues for the years ended March 31, 2015, 2014 and 2013, respectively. Arrow accounted for approximately 41% of total accounts receivable as of March 31, 2015 and 2014, respectively.
	The Company has an original equipment manufacturer agreement with Hitachi Data Systems (“HDS”) for them to market, sell and support our software applications and services on a stand-alone basis and/or incorporate our software applications into their own hardware products. HDS accounted for 10% of total revenues for the year ended March 31, 2015. HDS accounted for 11% of total accounts receivable as of March 31, 2015.
	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, 2015 and 2014, 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, 2015 and March 31, 2014:
	31-Mar-15		Level 1			Level 2			Level 3		Total
	Cash equivalents		$	204,939		—			—		$	204,939
	Short-term investments		—			$	49,955		—		$	49,955
	31-Mar-14		Level 1			Level 2			Level 3		Total
Cash equivalents		$	326,952		—			—		$	326,952
Short-term investments		—			$	24,993		—		$	24,993
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 $687 as of March 31, 2015 and $577 as of March 31, 2014.
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, 2015, 2014 and 2013.
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 and receipt of license fees that are deferred due to one or more of the revenue recognition criteria not being met. The value of deferred revenues will increase or decrease based on the timing of invoices and recognition of revenue. The Company expenses internal direct and incremental costs related to contract acquisition and origination as incurred.
Deferred revenue consists of the following:
		March 31,
		2015			2014
Current:
Deferred software revenue		$	1,305		$	666
Deferred services revenue		183,007			165,477
		184,312			166,143
Non-current:
Deferred services revenue		$	45,423		$	43,432
Total Deferred Revenue		229,735			209,575
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 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.
The Company classifies benefits of tax deductions in excess of the compensation cost recognized (excess tax benefits) as a financing item cash inflow with a corresponding operating cash outflow. For the years ended March 31, 2015, 2014 and 2013, the Company included $5,057, $28,337, and $23,080, respectively, as a financing cash inflow.
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. As a result of the Company’s stock repurchases in the fiscal year ended March 31, 2015, the Company reduced common stock and additional paid-in capital by $22,032 and increased accumulated deficit by $133,093.
Sales Tax
The Company records revenue net of sales tax.
Advertising Costs
The Company expenses advertising costs as incurred. Advertising expenses were $5,401, $6,174, and $4,646 for the years ended March 31, 2015, 2014 and 2013, 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 Income (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 Income. The Company recognized net foreign currency transaction gains of $127 and $324 and net foreign currency transaction losses $275 in the years ended March 31, 2015, March 31, 2014 and March 31, 2013, respectively. The net foreign currency transaction gains and losses recorded in “General and administrative expenses” include settlement gains and losses on forward contracts disclosed below.
To date, the Company has selectively hedged its exposure to foreign currency transaction gains and losses on the balance sheet through the use of forward contracts, which were not designated as hedging instruments. The duration of forward contracts utilized for hedging the Company’s balance sheet exposure is generally one month to three months. As of March 31, 2015 and March 31, 2014, the Company did not have any forward contracts outstanding. The Company recorded net realized gains in general and administrative expenses of $33 in fiscal 2015 and net realized losses of $82 in fiscal 2014 and $152 in fiscal 2013 related to the settlement of a forward exchange contracts. In the future, the Company may enter into additional foreign currency-based hedging contracts to reduce its exposure to significant fluctuations in currency exchange rates on the balance sheet.
Comprehensive Income
Comprehensive income is defined to include all changes in equity, except those resulting from investments by stockholders and distribution to stockholders.
Recently Issued Accounting Standards
In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers (Topic 606)." This amendment provides principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company is currently evaluating the accounting, transition and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption.
In July 2013, the FASB issued ASU No. 2013-11, “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” (“ASU 2013-11”). ASU 2013-11 addresses the diversity in practice regarding financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The guidance requires an unrecognized tax benefit, or a portion of, to be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. To the extent the deferred tax asset is not available at the reporting date to settle any additional income taxes that would result from the disallowance of a tax position; the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with the deferred tax asset. The amendments in this standard are effective for reporting periods in the current fiscal year. The adoption of ASU 2013-11 did not have a material impact 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.

Property_and_Equipment

Property and Equipment	12 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment
	Property and equipment consist of the following:
		March 31,
		2015			2014
	Land	$	9,445		$	—
	Buildings	102,880			—
	Computers, servers and other equipment	33,914			27,827
	Furniture and fixtures	14,399			2,409
	Leasehold improvements	4,621			8,911
	Purchased software	2,463			2,291
	Construction in process	619			79,182
		168,341			120,620
	Less: Accumulated depreciation and amortization	(28,133		)	(31,719		)
		$	140,208		$	88,901
	During fiscal 2015, the Company completed its move to a new owned corporate campus headquarters located in Tinton Falls, New Jersey. In connection with the move, the Company recorded accelerated depreciation on leasehold improvements associated with the prior headquarters location of $550 in fiscal 2015. As of March 31, 2015, the Company also had a lease termination liability of $1,242 related to rent and related costs associated with the prior headquarters location with is leased through July 31, 2015.
	The Company recorded depreciation and amortization expense of $8,856, $6,207, and $4,939 for the years ended March 31, 2015, 2014 and 2013, respectively.

Accrued_Liabilities

Accrued Liabilities	12 Months Ended
	Mar. 31, 2015
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Liabilities
	Accrued liabilities consist of the following:
		March 31,
		2015		2014
	Compensation and related payroll taxes	$	38,518	$	35,813
	Other	34,239		40,353
		$	72,757	$	76,166

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	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, 2015 are as follows:
	Year Ending March 31,
	2016	$	8,762
	2017	4,827
	2018	3,993
	2019	3,379
	2020 and thereafter	6,635
		$	27,596
	Rent expenses were $10,845, $11,405, and $10,037 for the years ended March 31, 2015, 2014 and 2013, 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, 2015 are approximately $9,286 for fiscal 2016, $2,759 for fiscal 2017, $1,129 for fiscal 2018 and $254 for fiscal 2019, totaling $13,428 for all periods through fiscal 2019. These purchase commitments primarily result from contracts for the acquisition of IT infrastructure, marketing and software development services and the construction of the Company’s corporate campus headquarters.
	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 revenues, was $1,768 in fiscal 2015, $1,350 in fiscal 2014 and $2,081 in fiscal 2013.
	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.
	Legal Proceedings
	In the normal course of its business, the Company may be involved in various claims, negotiations and legal actions. As of March 31, 2015, the Company is not aware of any asserted or unasserted claims, negotiations and legal actions for which a loss is considered reasonably possible of occurring and would require disclosure under the guidance.
	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, the Chief Executive Officer and the 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 asserts claims covering an alleged class period from May 7, 2013 through April 24, 2014. It is purportedly brought on behalf of purchasers of the Company's common stock during that period, 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. Defendants plan to file their motion to dismiss the complaint on May 26, 2015. At this time, the Company is unable to predict the outcome of this matter and cannot currently estimate a range of any possible losses that it may experience. Accordingly, the Company is unable at this time to estimate the effects of this lawsuit on its financial condition, results of operations, or cash flows. As of March 31, 2015 the Company has not recorded a reserve for this matter.
	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.

Revolving_Credit_Facility

Revolving Credit Facility	12 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Revolving Credit Facility	Revolving Credit Facility
	On June 30, 2014, the Company entered into a five-year $250,000 revolving credit facility (the “Credit Facility”). The Credit Facility is available for share repurchases, general corporate purposes, and letters of credit. The Credit Facility contains financial maintenance covenants including a leverage ratio and interest coverage ratio. The Credit Facility also contains certain customary events of default which would permit the lenders to, among other things, declare all loans then outstanding to be immediately due and payable if such default is not cured within applicable grace periods. The Credit Facility also limits the Company's ability to incur certain additional indebtedness, create or permit liens on assets, make acquisitions, make investments, loans or advances, sell or transfer assets, pay dividends or distributions, and engage in certain transactions with foreign affiliates. Outstanding borrowings under the Credit Facility accrue 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 is also subject to a 0.25% annual interest charge subject to increases based on the Company's actual leverage. As of March 31, 2015, there were no borrowings under the Credit Facility and the Company was in compliance with all covenants.
	The Company has deferred the expense related to debt issuance costs, which are classified as Other Assets, and will amortize the costs into interest expense over the term of the Credit Facility. Unamortized amounts at March 31, 2015 were $1,072. The amortization of debt issuance costs was $190 for year ended March 31, 2015 and is included in Interest expense.

Capitalization

Capitalization	12 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Capitalization	Capitalization
	As of March 31, 2015 and 2014, the Company had 250,000 shares of common stock and 50,000 shares of preferred stock authorized. As of March 31, 2015 and 2014 there were no shares of preferred stock outstanding.
	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 45,122 and 47,094 shares of common stock, par value $0.01, outstanding at March 31, 2015 and March 31, 2014, respectively.
	During fiscal 2015, the Company repurchased $155,125 of common stock, or 3,171 shares, under its share repurchase program. As of March 31, 2015, $100,002 remained in the stock repurchase authorization.
	Shares Reserved for Issuance
	The Company has reserved 11,059 shares in connection with its Stock Plans discussed in Note 8 at March 31, 2015.

Stock_Plans

Stock Plans	12 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Plans	Stock Plans
	As of March 31, 2015, the Company maintains two stock incentive plans, the 1996 Stock Option Plan (the “Plan”) and the 2006 Long-Term Stock Incentive Plan (the “LTIP”).
	Under the Plan, the Company may grant non-qualified stock options to purchase 11,705 shares of common stock to certain officers and employees. Stock options are granted at the discretion of the Board and expire 10 years from the date of the grant. At March 31, 2015, there were 572 options available for future grant under the Plan.
	The LTIP 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. On each April 1, the number of shares available for issuance under the LTIP is increased, if applicable, such that the total number of shares available for awards under the LTIP as of any April 1 is equal to 5% of the number of outstanding shares of the Company’s common stock on that April 1. As of March 31, 2015, approximately 757 shares were available for future issuance under the LTIP.
	As of March 31, 2015, the Company has granted non-qualified stock options and restricted stock units under its stock incentive plans. 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. 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 continue to include both non-qualified stock options and restricted stock units.
	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.
	As of March 31, 2015, there was approximately $122,977 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 2.55 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 assumptions used in the Black-Scholes option-pricing model are as follows:
		Year Ended March 31,
		2015		2014		2013
	Dividend yield	None		None		None
	Expected volatility	41% - 47%		42% - 47%		45% - 50%
	Weighted average expected volatility	46%		45%		47%
	Risk-free interest rates	1.22% - 2.18%		0.70% - 2.11%		0.60% - 1.40%
	Weighted average expected life (in years)	5.7		6.9		6.2
	The following summarizes the activity for the Company’s two stock incentive plans from March 31, 2012 to March 31, 2015:
	Options	Number of			Weighted-				Weighted-		Aggregate
		Options			Average				Average		Intrinsic
					Exercise Price				Remaining		Value
									Contractual
									Term (Years)
	Outstanding at March 31, 2012	6,656			$	19.19
	Options granted	1,289			60.07
	Options exercised	(1,361	)		13.32
	Options forfeited	(129	)		35.11
	Options expired	(16	)		11.24
	Outstanding at March 31, 2013	6,439			28.31
	Options granted	1,035			85.91
	Options exercised	(999	)		17.62
	Options forfeited	(87	)		50.05
	Options expired	—			—
	Outstanding at March 31, 2014	6,388			39.03
	Options granted	1,107			46.16
	Options exercised	(504	)		19.44
	Options forfeited	(159	)		65.93
	Options expired	(27	)		68.84
	Outstanding at March 31, 2015	6,805			$	40.89			6.07		$	81,082
	Vested or expected to vest at March 31, 2015	6,722			$	40.55			6.01		$	81,079
	Exercisable at March 31, 2015	4,349			$	30			4.62		$	80,671
	The weighted average fair value of stock options granted was $20.16 per share, $41.70 per share, and $27.28 per share during the years ended March 31, 2015, 2014 and 2013, respectively. The total intrinsic value of options exercised was $15,069, $59,509, and $65,973 in the years ended March 31, 2015, 2014 and 2013, respectively. The Company’s policy is to issue new shares upon exercise of options as the Company does not hold shares in treasury.
	The following table summarizes information on stock options outstanding under the Plan and LTIP at March 31, 2015:
	Range of Exercise Prices	Options			Weighted-Average						Options		Weighted-
		Outstanding at									Exercisable at		Average
		March 31,									March 31,		Exercise Price
		2015			Remaining		Exercise Price				2015
					Contractual Life
	$  4.50 - 13.81	1,562			2.22		$	9.63			1,562		$	9.63
	14.25 - 41.55	2,097			5.33		30.42				1,922		29.42
	43.30 - 56.57	1,923			8.55		50.44				499		55.84
	58.25 - 86.64	387			8.11		76.34				97		78.03
	87.2	836			8.42		87.2				269		87.2
	$  4.50 - 87.20	6,805			6.07		$	40.89			4,349		$	30
	Restricted stock unit activity is as follows:
	Non-Vested Restricted Stock Units	Number			Weighted
		of			Average
		Awards			Grant Date
					Fair Value
	Non-vested as of March 31, 2012	1,113			$	33.24
	Granted	613			57.01
	Vested	(442	)		29.79
	Forfeited	(86	)		37.49
	Non-vested as of March 31, 2013	1,198			46.45
	Granted	562			84.66
	Vested	(473	)		42.11
Forfeited	(85	)		53.57
Non-vested as of March 31, 2014	1,202			65.63
Granted	791			46.69
Vested	(491	)		59.22
Forfeited	(114	)		63.7
Non-vested as of March 31, 2015	1,388			$	57.04
The total fair value of the restricted stock units that vested during the years ended March 31, 2015, 2014 and 2013 was $24,592, $37,584 and $25,649, 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, 2015, 2014 and 2013.
	Year Ended March 31,
	2015				2014				2013
Cost of services revenue	$	2,930			$	1,428			$	963
Sales and marketing	26,853				20,813				13,508
Research and development	5,908				4,512				3,020
General and administrative	24,972				22,371				12,607
Stock-based compensation expense	$	60,663			$	49,124			$	30,098
The Company recognized a tax benefit related to stock-based compensation of $18,570 in the year ended March 31, 2015, $15,940 in the year ended March 31, 2014 and $8,901 in the year ended March 31, 2013.
Performance Based Awards
On March 31, 2015, the Company’s CEO was granted 46 performance stock options (“PSO”) and 24 performance restricted stock units (“PSU”). The vesting of these awards is contingent upon the Company meeting certain fiscal 2016 revenue and earnings targets. The PSOs only vest if the Company meets a threshold against fiscal 2016 revenue and earnings targets. The amount of PSUs that can ultimately vest is based on a sliding scale of achievement against fiscal 2016 revenue and earnings targets. The PSOs and PSUs are also subject to a service period of approximately 3.5 years, vesting quarterly over this period, subject to a cumulative vesting catch-up after the fiscal 2016 results measurement date.
The fair value of the PSOs and PSUs was measured in the same manner as the Company’s non-performance based awards. Compensation cost related to the PSOs and PSUs is recognized on a straight-line basis over the 3.5 year service period. The fair value of the PSO and PSU grants was $1,012 and $1,041, respectively. These awards have not been included in the roll forwards above. The PSOs and PSUs are being accounted for as equity awards.
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 204 shares in exchange for $7,906 of proceeds in fiscal 2015. There were no purchases in the prior year related to the plan. 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 2015 and 2014 was $2,960 and $395, respectively. The fiscal 2014 expense represents two months of the initial six month purchase period. As of March 31, 2015, there was approximately $902 of unrecognized cost related to the current purchase period of our Employee Stock Purchase Plan.

Income_Taxes

Income Taxes	12 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The components of income before income taxes were as follows:
			Year Ended March 31,
			2015				2014				2013
	Domestic		$	28,048			$	89,946			$	72,650
	Foreign		10,844				11,364				9,304
			$	38,892			$	101,310			$	81,954
	The components of income tax expense (benefit) were as follows:
			Year Ended March 31,
			2015				2014				2013
	Current:
	Federal		$	1,777			$	34,406			$	23,537
	State		2,533				4,063				2,238
	Foreign		4,791				5,207				5,073
	Deferred:
	Federal		4,237				(5,453		)		(1,107		)
	State		(24		)		(616		)		18
	Foreign		(72		)		(361		)		(1,014		)
			$	13,242			$	37,246			$	28,745
	A reconciliation of the statutory tax rates and the effective tax rates for the years ended March 31, 2015, 2014 and 2013 are as follows:
			Year Ended March 31,
			2015			2014			2013
	Statutory federal income tax expense rate		35	%		35	%		35	%
	State and local income tax expense, net of federal income tax effect		3			2.5			2.5
	Impact of limit on executive compensation		3.2			1.5			0.8
	Foreign earnings taxed at different rates		1			0.7			0.4
	Domestic permanent differences		4.1			0.3			1.1
	Foreign tax credits		(2.8	)		(1.3	)		(1.4	)
	Research credits		(4.9	)		(1.9	)		(3.0	)
	Tax reserves		(5.3	)		(0.8	)		0.1
	Other differences, net		0.7			0.8			(0.4	)
	Effective income tax expense		34	%		36.8	%		35.1	%
	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. The Company assesses the likelihood that its deferred tax assets will be recovered from future taxable income, and to the extent that the Company believes recovery is not likely, the Company establishes a valuation allowance. The significant components of the Company’s deferred tax assets are as follows:
			March 31,
			2015				2014
	Deferred tax assets:
	Stock-based compensation		$	30,561			$	23,261
	Deferred revenue		10,542				9,266
	Tax credits		6,229				10,268
	Accrued expenses		1,570				1,240
	Allowance for doubtful accounts and other reserves		697				943
	Net operating losses		26				724
	Depreciation and amortization		—				2,383
	Less: valuation allowance		(1,343		)		(1,382		)
	Total deferred tax assets		48,282				46,703
	Deferred tax liabilities:
	Depreciation and amortization		(7,237		)		—
	Net deferred tax asset		$	41,045			$	46,703
	At March 31, 2015 the Company maintained valuation allowances totaling $1,343 against New Jersey state research tax credits due to uncertainties related to the ability to utilize such state research tax credits before they expire. The Company based its valuation allowance on its estimates of taxable income by legal entity and the period over which its state research tax credits will be recoverable.
	It is the Company’s intention to reinvest undistributed earnings of its foreign subsidiaries and thereby infinitely postpone their remittance. As a result, deferred U.S. income taxes have not been provided on undistributed earnings of foreign subsidiaries of the Company. In the event we 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 or U.S. income taxes. It is not currently practical to estimate the legal restrictions or tax liability that would arise from such repatriations. The cumulative amount of unremitted earnings from the foreign subsidiaries that is expected to be permanently reinvested was approximately $18,659 on March 31, 2015.
	Excess tax benefits related to share-based payments are credited to equity. When determining this excess tax benefit, the Company elected to follow the tax law approach. As a result, the Company’s excess tax benefit which was recorded to equity was approximately $2,141 and $28,416 for the years ended March 31, 2015 and 2014, respectively.
	At March 31, 2015, the Company has federal and state research tax credit (R&D credits) carryforwards of approximately $2,601 and $4,203, respectively. The federal research tax credit carryforwards expire from 2025 through 2035, and the state research tax credit carryforwards expire from 2016 through 2023. At March 31, 2015, the Company has federal Alternative Minimum Tax credit carryforwards of $1,149.
	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 as the United States, Australia, Canada, Germany, Netherlands and United Kingdom. The Company's French branch of its Netherlands subsidiary is currently under audit for the fiscal years ended March 31, 2004 through March 31, 2014 by the French tax authorities. 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, 2015. 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	2005 - Present
	New Jersey	2002 - Present
	Foreign jurisdictions	2004 - 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, 2012	$	4,699
	Additions for tax positions related to fiscal 2013	401
	Additions for tax positions related to prior years	—
	Settlements and effective settlements with tax authorities and remeasurements	(511		)
	Reductions related to the expiration of statutes of limitations	—
Foreign currency translation adjustment	(19		)
Balance at March 31, 2013	4,570
Additions for tax positions related to fiscal 2014	316
Additions for tax positions related to prior years	433
Settlements and effective settlements with tax authorities and remeasurements	(1,283		)
Reductions related to the expiration of statutes of limitations	—
Foreign currency translation adjustment	77
Balance at March 31, 2014	4,113
Additions for tax positions related to fiscal 2015	490
Additions for tax positions related to prior years	252
Settlements and effective settlements with tax authorities and remeasurements	(2,838		)
Reductions related to the expiration of statutes of limitations	—
Foreign currency translation adjustment	(12		)
Balance at March 31, 2015	$	2,005
All of the Company’s unrecognized tax benefits at March 31, 2015 of $2,005, if recognized, would favorably affect the effective tax rate. Components of the reserve are classified as either current or long-term in the Consolidated Balance Sheet based on when the Company expects each of the items to be settled.  Unrecognized tax benefits and the related accrued interest and penalties totaling $1,634 are recorded as Other Liabilities on the Consolidated Balance Sheet, of which $333 represents interest and penalties. The Company also has unrecognized tax benefits and related accrued interest and penalties totaling $771 as a reduction of Deferred Tax Assets on the Consolidated Balance Sheet, of which $68 represents interest and penalties.
The Company believes that it is reasonably possible that approximately $76 of its currently remaining unrecognized tax benefits may be realized by the end of the fiscal year ending March 31, 2016 as a result of the lapse of the statute of limitations. Interest and penalties related to unrecognized tax benefits are recorded in income tax expense. In the years ended March 31, 2015, 2014 and 2013, the Company recognized $224, $89 and $107, respectively, of interest and penalties in the Consolidated Statement of Income.

Employee_Benefit_Plan

Employee Benefit Plan	12 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [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, 2015, 2014 and 2013, the Company made contributions of $1,955, $1,451, and $1,132, respectively.

Segment_Information

Segment Information	12 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Information	Segment Information
	The Company operates in one segment storage software solutions. 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,
		2015		2014		2013
	Revenue:
	United States	$	344,931	$	333,700	$	288,370
	Other	262,612		252,640		207,480
		$	607,543	$	586,340	$	495,850
	No individual country other than the United States accounts for 10% or more of revenues in the years ended March 31, 2015, 2014 and 2013. Revenue included in the “Other” caption above primarily relates to the Company’s operations in Europe, Australia, Canada and Asia.
		March 31,
		2015		2014
	Long-lived assets:
	United States	$	143,975	$	89,523
	Other	3,037		6,593
		$	147,012	$	96,116
	At March 31, 2015 no other individual country, other than the United States, accounts for 10% or more of long-lived assets.

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data (unaudited)	12 Months Ended
	Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (unaudited)	Selected Quarterly Financial Data (unaudited)
			Quarter Ended
			June 30		September 30		December 31		March 31
	Fiscal 2015
	Total revenue		$	152,643	$	151,144	$	153,021	$	150,735
	Gross margin		131,716		130,858		133,080		129,821
	Net income		12,729		6,496		3,073		3,352
	Net income per common share:
	Basic (1)		$	0.28	$	0.14	$	0.07	$	0.07
	Diluted (1)		$	0.27	$	0.14	$	0.07	$	0.07
			Quarter Ended
			June 30		September 30		December 31		March 31
	Fiscal 2014
	Total revenue		$	134,408	$	141,863	$	153,250	$	156,819
	Gross margin		116,630		123,707		134,752		136,950
	Net income		13,462		17,354		17,591		15,657
	Net income per common share:
	Basic (1)		$	0.29	$	0.37	$	0.37	$	0.33
	Diluted (1)		$	0.27	$	0.35	$	0.35	$	0.32
	-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.

Schedule_II_Valuation_and_Qual

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Mar. 31, 2015
Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	Schedule II — Valuation and Qualifying Accounts
		Balance at		Charged			Deductions		Balance at
		Beginning of		(Credited)  to					End of
		Year		Costs and					Year
				Expenses
		(In thousands)
	Year Ended March 31, 2013
	Allowance for doubtful accounts	$	97	$	12		$	6	$	103
	Valuation allowance for deferred taxes	$	1,420	$	—		$	25	$	1,395
	Year Ended March 31, 2014
	Allowance for doubtful accounts	$	103	$	8		$	—	$	111
	Valuation allowance for deferred taxes	$	1,395	$	—		$	13	$	1,382
	Year Ended March 31, 2015
	Allowance for doubtful accounts	$	111	$	1		$	8	$	104
	Valuation allowance for deferred taxes	$	1,382	$	(39	)	$	—	$	1,343

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	The consolidated financial statements include the accounts of the Company. All intercompany transactions and balances have been eliminated.
Use of Estimates	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, income taxes and related reserves, stock-based compensation and accounting for research and development costs. Actual results could differ from those estimates.
Revenue Recognition	Revenue Recognition
	The Company derives revenues from two primary sources: software licenses and services. Services include customer support, consulting, assessment and design services, installation services and training. A typical sales arrangement includes both licenses and services.
	For sales arrangements involving multiple elements, the Company recognizes revenue using the residual method. Under the residual method, the Company allocates and defers revenue for the undelivered elements based on fair value and recognizes the difference between the total arrangement fee and the amount deferred for the undelivered elements as revenue. The determination of fair value of the undelivered elements in multiple-element arrangements is based on the price charged when such elements are sold separately, which is commonly referred to as vendor-specific objective-evidence, or VSOE.
	The Company’s software licenses typically provide for a perpetual right to use the Company’s software and are sold on a per terabyte capacity basis, on a per-copy basis, as site licenses or as a solution set. Software licenses sold on a capacity basis provide the customer with unlimited licenses of specified software products based on a defined level of terabytes of data under management. Site licenses give the customer the additional right to deploy the software on a limited basis during a specified term. Solution sets are generally sold on a per unit basis such as per virtual machine for our virtual machine backup, recovery and cloud management solution set; per mailbox for our email archive solution set and per user for our endpoint data protection solution set.
	The Company recognizes software revenue through direct sales channels upon receipt of a purchase order or other persuasive evidence and when all other basic revenue recognition criteria are met as described below. The Company recognizes software revenue through all indirect sales channels on a sell-through model. A sell-through model requires that the Company recognize revenue when the basic revenue recognition criteria are met as described below and these channels complete the sale of the Company’s software products to the end-user. Revenue from software licenses sold through an original equipment manufacturer partner is recognized upon the receipt of a royalty report or purchase order from that original equipment manufacturer partner.
	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. Customer support revenue is recognized ratably over the term of the customer support agreement, which is typically one year. To determine the price for the customer support element when sold separately, the Company primarily uses historical renewal rates. Historical renewal rates are supported by performing an analysis in which the Company segregates its customer support renewal contracts into different classes based on specific criteria including, but not limited to, the dollar amount of the software purchased, the level of customer support being provided and the distribution channel. As a result of this analysis, the Company has concluded that it has established VSOE for the different classes of customer support when the support is sold as part of a multiple-element sales arrangement. The Company’s determination of fair value for customer support has not changed for the periods presented.
	The Company’s other professional services include consulting services, implementation and post-deployment services and education services. Other professional services provided by the Company are not mandatory and can also be performed by the customer or a third-party. In addition to a signed purchase order, the Company’s consulting services and implementation and post-deployment services are, in some cases, evidenced by a Statement of Work, which defines the specific scope of such services to be performed when sold and performed on a stand-alone basis or included in multiple-element sales arrangements. Revenues from consulting services and implementation and post-deployment services are based upon a daily or weekly rate and are recognized when the services are completed. Education services include courses taught by the Company’s instructors or third-party contractors either at one of the Company’s facilities or at the customer’s site. Education services fees are recognized as revenue after the course has been provided. Based on the Company’s analysis of such other professional services transactions sold on a stand-alone basis, the Company has concluded it has established VSOE for such other professional services when sold in connection with a multiple-element sales arrangement. The Company generally performs its other professional services within 90 days of entering into an agreement. The Company’s determination of fair value for other professional services has not changed for the periods presented.
	The Company has analyzed all of the undelivered elements included in its multiple-element sales arrangements and determined that VSOE of fair value exists to allocate revenues to services. Accordingly, assuming all basic revenue recognition criteria are met, software revenue is recognized upon delivery of the software license using the residual method.
	The Company considers the four basic revenue recognition criteria for each of the elements as follows:
	•	Persuasive evidence of an arrangement with the customer exists.    The Company’s customary practice is to require a purchase order and, in some cases, a written contract signed by both the customer and the Company, or other persuasive evidence that an arrangement exists prior to recognizing revenue related to an arrangement.
	•	Delivery or performance has occurred.    The Company’s software applications are either physically or electronically delivered to customers with standard transfer terms such as FOB shipping point. Software and/or software license keys for add-on orders or software updates are typically delivered in an electronic format. If products that are essential to the functionality of the delivered software in an arrangement have not been delivered, the Company does not consider delivery to have occurred. Services revenue is recognized when the services are completed, except for customer support, which is recognized ratably over the term of the customer support agreement, which is typically one year.
	•	Vendor’s fee is fixed or determinable.    The fee customers pay for software applications, customer support and other professional services is negotiated at the outset of a sales arrangement. The fees are therefore considered to be fixed or determinable at the inception of the arrangement. The Company evaluates instances when extended payment terms are granted to determine if revenue should be deferred until payment becomes due.
	•	Collection is probable.     Probability of collection is assessed on a customer-by-customer basis. Each new customer undergoes a credit review process to evaluate its financial position and ability to pay. If the Company determines from the outset of an arrangement that collection is not probable based upon the review process, revenue is recognized at the earlier of when cash is collected or when sufficient credit becomes available, assuming all of the other basic revenue recognition criteria are met.
	The Company’s sales arrangements generally do not include acceptance clauses. However, if an arrangement does include an acceptance clause, revenue for such an arrangement is deferred and recognized upon acceptance. Acceptance occurs upon the earliest of receipt of a written customer acceptance, waiver of customer acceptance or expiration of the acceptance period.
Net Income Per Common Share	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.
Software Development Costs	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.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts
	Accounts receivable consist of amounts due to the Company from normal business activities. The Company maintains an allowance for estimated losses resulting from the inability of its customers to make required payments. The Company estimates uncollectible amounts based upon historical bad debts, evaluation of current customer receivable balances, age of customer receivable balances, the customer’s financial condition and current economic trends.
Accounting for Income Taxes	Accounting for Income Taxes
	As part of the process of preparing financial statements, the Company is required to estimate its income taxes in each of the jurisdictions in which it operates. This process involves estimating actual current tax exposure, including assessing the risks associated with tax audits, and assessing temporary differences resulting from different treatment of items for tax and accounting purposes. These differences result in deferred tax assets and liabilities. As of March 31, 2015, the Company had net deferred tax assets of approximately $41,045, which were primarily related to stock-based compensation, deferred revenue, and federal and state research tax credit carryforwards. The Company assesses the likelihood that its deferred tax assets will be recovered from future taxable income, and to the extent that the Company believes recovery is not likely, the Company establishes a valuation allowance. As of March 31, 2015, the Company maintains a valuation allowance against its deferred tax assets totaling $1,343 primarily related to the uncertainty of the Company’s ability to utilize New Jersey state research tax credits before they expire. The Company based its valuation allowance on its estimates of taxable income by legal entity and the period over which its state research tax credits will be recoverable.
	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. The Company applies the guidance issued to address the accounting for uncertain tax positions. This guidance clarifies the accounting for income taxes, by prescribing a minimum recognition threshold a tax position is required to meet before being recognized in the financial statements as well as provides guidance on derecognition, measurement, classification, interest and penalties, accounting in interim periods, disclosure and transition.
	As of March 31, 2015, the Company had unrecognized tax benefits of $2,005, all of which, if recognized, would favorably affect the effective tax rate. In addition, the Company had accrued interest and penalties of $401 related to the unrecognized tax benefits. Interest and penalties, if any, related to unrecognized tax benefits are recorded in income tax expense. Components of the reserve are classified as either current or long-term in the Consolidated Balance Sheet based on when we expect each of the items to be settled. However, unrecognized tax benefits which are related to a Deferred Tax Asset recorded in the Consolidated Balance Sheet are presented as a reduction against the related Deferred Tax Asset.
Cash and Cash Equivalents	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, 2015, the Company’s cash and cash equivalents balance consisted primarily of money market funds.
Short-term Investments	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 Income. 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	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	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, 2015 and 2014, 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.
Property and Equipment	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	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.
Long-Lived Assets	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.
Deferred Revenue	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 and receipt of license fees that are deferred due to one or more of the revenue recognition criteria not being met. The value of deferred revenues will increase or decrease based on the timing of invoices and recognition of revenue. The Company expenses internal direct and incremental costs related to contract acquisition and origination as incurred.
Accounting for Stock-Based Compensation	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 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.
	The Company classifies benefits of tax deductions in excess of the compensation cost recognized (excess tax benefits) as a financing item cash inflow with a corresponding operating cash outflow.
Share Repurchases	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	Sales Tax
	The Company records revenue net of sales tax.
Advertising Costs	Advertising Costs
	The Company expenses advertising costs as incurred.
Shipping and Handling Costs	Shipping and Handling Costs
	Shipping and handling costs are included in cost of revenues for all periods presented.
Foreign Currency Translation	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 Income (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 Income.
Comprehensive Income	Comprehensive Income
	Comprehensive income is defined to include all changes in equity, except those resulting from investments by stockholders and distribution to stockholders.
Recently Issued Accounting Standards	Recently Issued Accounting Standards
	In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers (Topic 606)." This amendment provides principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company is currently evaluating the accounting, transition and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption.
	In July 2013, the FASB issued ASU No. 2013-11, “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” (“ASU 2013-11”). ASU 2013-11 addresses the diversity in practice regarding financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The guidance requires an unrecognized tax benefit, or a portion of, to be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. To the extent the deferred tax asset is not available at the reporting date to settle any additional income taxes that would result from the disallowance of a tax position; the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with the deferred tax asset. The amendments in this standard are effective for reporting periods in the current fiscal year. The adoption of ASU 2013-11 did not have a material impact 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.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Computation of Basic and Diluted Net Income Per Common Share	The following table sets forth the computation of basic and diluted net income per common share:
		Year Ended March 31,
		2015			2014			2013
	Net income	$	25,650		$	64,064		$	53,209
	Basic net income per common share:
	Basic weighted average shares outstanding	45,464			46,976			45,463
	Basic net income per common share	$	0.56		$	1.36		$	1.17
	Diluted net income per common share:
	Basic weighted average shares outstanding	45,464			46,976			45,463
	Dilutive effect of stock options, restricted stock units, and employee stock purchase plan	1,758			2,666			2,867
	Diluted weighted average shares outstanding	47,222			49,642			48,330
	Diluted net income per common share	$	0.54		$	1.29		$	1.1
Summary of Potential Outstanding Common Stock Equivalents	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,
		2015		2014			2013
	Stock options, restricted stock units, and shares under the employee stock purchase plan	3,136		964			554
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, 2015 and March 31, 2014:
	31-Mar-15	Level 1			Level 2			Level 3		Total
	Cash equivalents	$	204,939		—			—		$	204,939
	Short-term investments	—			$	49,955		—		$	49,955
	31-Mar-14	Level 1			Level 2			Level 3		Total
	Cash equivalents	$	326,952		—			—		$	326,952
	Short-term investments	—			$	24,993		—		$	24,993
Deferred Revenue	Deferred revenue consists of the following:
		March 31,
		2015			2014
	Current:
	Deferred software revenue	$	1,305		$	666
	Deferred services revenue	183,007			165,477
		184,312			166,143
	Non-current:
	Deferred services revenue	$	45,423		$	43,432
	Total Deferred Revenue	229,735			209,575

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and equipment consist of the following:
		March 31,
		2015			2014
	Land	$	9,445		$	—
	Buildings	102,880			—
	Computers, servers and other equipment	33,914			27,827
	Furniture and fixtures	14,399			2,409
	Leasehold improvements	4,621			8,911
	Purchased software	2,463			2,291
	Construction in process	619			79,182
		168,341			120,620
	Less: Accumulated depreciation and amortization	(28,133		)	(31,719		)
		$	140,208		$	88,901

Accrued_Liabilities_Tables

Accrued Liabilities (Tables)	12 Months Ended
	Mar. 31, 2015
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued liabilities consist of the following:
		March 31,
		2015		2014
	Compensation and related payroll taxes	$	38,518	$	35,813
	Other	34,239		40,353
		$	72,757	$	76,166

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Lease Payments Under All Operating Leases	Future minimum lease payments under all operating leases at March 31, 2015 are as follows:
	Year Ending March 31,
	2016	$	8,762
	2017	4,827
	2018	3,993
	2019	3,379
	2020 and thereafter	6,635
		$	27,596

Stock_Plans_Tables

Stock Plans (Tables)	12 Months Ended
	Mar. 31, 2015
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,
		2015		2014		2013
	Dividend yield	None		None		None
	Expected volatility	41% - 47%		42% - 47%		45% - 50%
	Weighted average expected volatility	46%		45%		47%
	Risk-free interest rates	1.22% - 2.18%		0.70% - 2.11%		0.60% - 1.40%
	Weighted average expected life (in years)	5.7		6.9		6.2
Schedule of Stock Option Activity	The following summarizes the activity for the Company’s two stock incentive plans from March 31, 2012 to March 31, 2015:
	Options	Number of			Weighted-				Weighted-		Aggregate
		Options			Average				Average		Intrinsic
					Exercise Price				Remaining		Value
									Contractual
									Term (Years)
	Outstanding at March 31, 2012	6,656			$	19.19
	Options granted	1,289			60.07
	Options exercised	(1,361	)		13.32
	Options forfeited	(129	)		35.11
	Options expired	(16	)		11.24
	Outstanding at March 31, 2013	6,439			28.31
	Options granted	1,035			85.91
	Options exercised	(999	)		17.62
	Options forfeited	(87	)		50.05
	Options expired	—			—
	Outstanding at March 31, 2014	6,388			39.03
	Options granted	1,107			46.16
	Options exercised	(504	)		19.44
	Options forfeited	(159	)		65.93
	Options expired	(27	)		68.84
	Outstanding at March 31, 2015	6,805			$	40.89			6.07		$	81,082
	Vested or expected to vest at March 31, 2015	6,722			$	40.55			6.01		$	81,079
	Exercisable at March 31, 2015	4,349			$	30			4.62		$	80,671
Summary of Stock Options Outstanding Under Plan And LTIP	The following table summarizes information on stock options outstanding under the Plan and LTIP at March 31, 2015:
	Range of Exercise Prices	Options			Weighted-Average						Options		Weighted-
		Outstanding at									Exercisable at		Average
		March 31,									March 31,		Exercise Price
		2015			Remaining		Exercise Price				2015
					Contractual Life
	$  4.50 - 13.81	1,562			2.22		$	9.63			1,562		$	9.63
	14.25 - 41.55	2,097			5.33		30.42				1,922		29.42
	43.30 - 56.57	1,923			8.55		50.44				499		55.84
	58.25 - 86.64	387			8.11		76.34				97		78.03
	87.2	836			8.42		87.2				269		87.2
	$  4.50 - 87.20	6,805			6.07		$	40.89			4,349		$	30
Schedule of Restricted Stock Unit Activity	Restricted stock unit activity is as follows:
	Non-Vested Restricted Stock Units	Number			Weighted
		of			Average
		Awards			Grant Date
					Fair Value
	Non-vested as of March 31, 2012	1,113			$	33.24
	Granted	613			57.01
	Vested	(442	)		29.79
	Forfeited	(86	)		37.49
	Non-vested as of March 31, 2013	1,198			46.45
	Granted	562			84.66
	Vested	(473	)		42.11
	Forfeited	(85	)		53.57
	Non-vested as of March 31, 2014	1,202			65.63
	Granted	791			46.69
	Vested	(491	)		59.22
	Forfeited	(114	)		63.7
	Non-vested as of March 31, 2015	1,388			$	57.04
Stock-Based Compensation Expense	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, 2015, 2014 and 2013.
		Year Ended March 31,
		2015				2014				2013
	Cost of services revenue	$	2,930			$	1,428			$	963
	Sales and marketing	26,853				20,813				13,508
	Research and development	5,908				4,512				3,020
	General and administrative	24,972				22,371				12,607
	Stock-based compensation expense	$	60,663			$	49,124			$	30,098

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Components of Income Before Income Taxes	The components of income before income taxes were as follows:
			Year Ended March 31,
			2015				2014				2013
	Domestic		$	28,048			$	89,946			$	72,650
	Foreign		10,844				11,364				9,304
			$	38,892			$	101,310			$	81,954
Components of Income Tax Expense (Benefit)	The components of income tax expense (benefit) were as follows:
			Year Ended March 31,
			2015				2014				2013
	Current:
	Federal		$	1,777			$	34,406			$	23,537
	State		2,533				4,063				2,238
	Foreign		4,791				5,207				5,073
	Deferred:
	Federal		4,237				(5,453		)		(1,107		)
	State		(24		)		(616		)		18
	Foreign		(72		)		(361		)		(1,014		)
			$	13,242			$	37,246			$	28,745
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, 2015, 2014 and 2013 are as follows:
			Year Ended March 31,
			2015			2014			2013
	Statutory federal income tax expense rate		35	%		35	%		35	%
	State and local income tax expense, net of federal income tax effect		3			2.5			2.5
	Impact of limit on executive compensation		3.2			1.5			0.8
	Foreign earnings taxed at different rates		1			0.7			0.4
	Domestic permanent differences		4.1			0.3			1.1
	Foreign tax credits		(2.8	)		(1.3	)		(1.4	)
	Research credits		(4.9	)		(1.9	)		(3.0	)
	Tax reserves		(5.3	)		(0.8	)		0.1
	Other differences, net		0.7			0.8			(0.4	)
	Effective income tax expense		34	%		36.8	%		35.1	%
Components of Deferred Tax Assets	The significant components of the Company’s deferred tax assets are as follows:
			March 31,
			2015				2014
	Deferred tax assets:
	Stock-based compensation		$	30,561			$	23,261
	Deferred revenue		10,542				9,266
	Tax credits		6,229				10,268
	Accrued expenses		1,570				1,240
	Allowance for doubtful accounts and other reserves		697				943
	Net operating losses		26				724
	Depreciation and amortization		—				2,383
	Less: valuation allowance		(1,343		)		(1,382		)
	Total deferred tax assets		48,282				46,703
	Deferred tax liabilities:
	Depreciation and amortization		(7,237		)		—
	Net deferred tax asset		$	41,045			$	46,703
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, 2015. 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	2005 - Present
	New Jersey	2002 - Present
	Foreign jurisdictions	2004 - Present
Reconciliation of Amounts of Unrecognized Tax Benefits	A reconciliation of the amounts of unrecognized tax benefits is as follows:
	Balance at March 31, 2012	$	4,699
	Additions for tax positions related to fiscal 2013	401
	Additions for tax positions related to prior years	—
	Settlements and effective settlements with tax authorities and remeasurements	(511		)
	Reductions related to the expiration of statutes of limitations	—
	Foreign currency translation adjustment	(19		)
	Balance at March 31, 2013	4,570
	Additions for tax positions related to fiscal 2014	316
	Additions for tax positions related to prior years	433
	Settlements and effective settlements with tax authorities and remeasurements	(1,283		)
	Reductions related to the expiration of statutes of limitations	—
	Foreign currency translation adjustment	77
	Balance at March 31, 2014	4,113
	Additions for tax positions related to fiscal 2015	490
	Additions for tax positions related to prior years	252
	Settlements and effective settlements with tax authorities and remeasurements	(2,838		)
	Reductions related to the expiration of statutes of limitations	—
	Foreign currency translation adjustment	(12		)
	Balance at March 31, 2015	$	2,005

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Mar. 31, 2015
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,
		2015		2014		2013
	Revenue:
	United States	$	344,931	$	333,700	$	288,370
	Other	262,612		252,640		207,480
		$	607,543	$	586,340	$	495,850
Schedule of Long-Lived Assets by Geographic Area
		March 31,
		2015		2014
	Long-lived assets:
	United States	$	143,975	$	89,523
	Other	3,037		6,593
		$	147,012	$	96,116

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (unaudited) (Tables)	12 Months Ended
	Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of Selected Quarterly Financial Data
			Quarter Ended
			June 30		September 30		December 31		March 31
	Fiscal 2015
	Total revenue		$	152,643	$	151,144	$	153,021	$	150,735
	Gross margin		131,716		130,858		133,080		129,821
	Net income		12,729		6,496		3,073		3,352
	Net income per common share:
	Basic (1)		$	0.28	$	0.14	$	0.07	$	0.07
	Diluted (1)		$	0.27	$	0.14	$	0.07	$	0.07
			Quarter Ended
			June 30		September 30		December 31		March 31
	Fiscal 2014
	Total revenue		$	134,408	$	141,863	$	153,250	$	156,819
	Gross margin		116,630		123,707		134,752		136,950
	Net income		13,462		17,354		17,591		15,657
	Net income per common share:
	Basic (1)		$	0.29	$	0.37	$	0.37	$	0.33
	Diluted (1)		$	0.27	$	0.35	$	0.35	$	0.32
	-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_Account3

Summary of Significant Accounting Policies (Additional Information) (Detail) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
	revenue_source
Summary Of Significant Accounting Policies [Line Items]
Sources of primary revenue	2
Length of customer support agreement - in years	1 year
Number of days for other professional services	90 days
Net deferred tax assets	$41,045,000	$46,703,000
Valuation allowance for deferred tax assets	1,343,000
Unrecognized tax benefits which would favorably affect the effective tax rate once recognized	2,005,000
Accrued interest and penalties	401,000
Asset retirement obligation	687,000	577,000
Asset Impairment Charges	0	0	0
Excess tax benefits recognized as a financing cash inflow	5,057,000	28,337,000	23,080,000
Decrease of common stock and additional paid-in capital as result of common stock repurchases	22,032,000
Increase of accumulated deficit as result of common stock repurchases	133,093,000
Advertising expenses	5,401,000	6,174,000	4,646,000
Net foreign currency transaction gain (loss)	127,000	324,000	-275,000
Duration of forward contracts utilized for hedging, Minimum (in months)	1 month
Duration of forward contracts utilized for hedging, Maximum (in months)	3 months
Net realized gains (losses) related to settlement of forward exchange contracts recorded in general and administrative expenses	$33,000	($82,000)	($152,000)
Computers, servers and other equipment | Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, depreciation period	18 months
Computers, servers and other equipment | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, depreciation period	3 years
Furniture and fixtures | Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, depreciation period	3 years
Furniture and fixtures | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, depreciation period	12 years
Arrow | Revenue
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	36.00%	31.00%	29.00%
Arrow | Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	41.00%	41.00%
HDS | Revenue
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	10.00%
HDS | Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	11.00%

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Computation of Basic and Diluted Net Income Per Common Share) (Detail) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share, Basic and Diluted [Abstract]
Net income	$3,352		$3,073		$6,496		$12,729		$15,657		$17,591		$17,354		$13,462		$25,650	$64,064	$53,209
Basic net income per common share:
Basic weighted average shares outstanding (shares)																	45,464	46,976	45,463
Basic net income per common share (in dollars per share)	$0.07	[1]	$0.07	[1]	$0.14	[1]	$0.28	[1]	$0.33	[1]	$0.37	[1]	$0.37	[1]	$0.29	[1]	$0.56	$1.36	$1.17
Diluted net income per common share:
Basic weighted average shares outstanding (shares)																	45,464	46,976	45,463
Dilutive effect of stock options, restricted stock units, and Employee Stock Purchase Plan (in shares)																	1,758	2,666	2,867
Diluted weighted average shares outstanding (in shares)																	47,222	49,642	48,330
Diluted net income per common share (in dollars per share)	$0.07	[1]	$0.07	[1]	$0.14	[1]	$0.27	[1]	$0.32	[1]	$0.35	[1]	$0.35	[1]	$0.27	[1]	$0.54	$1.29	$1.10
[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_Account5

Summary of Significant Accounting Policies (Summary of Potential Outstanding Common Stock Equivalents) (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Accounting Policies [Abstract]
Stock options, restricted stock units, and shares under the employee stock purchase plan	3,136	964	554

Summary_of_Significant_Account6

Summary of Significant Accounting Policies (Summary of Fair Value of Financial Assets) (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$204,939	$326,952
Short-term investments	49,955	24,993
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	204,939	326,952
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	49,955	24,993
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_Account7

Summary of Significant Accounting Policies (Deferred Revenue) (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Deferred Revenue Arrangement [Line Items]
Deferred revenue, Current	$184,312	$166,143
Deferred revenue, Non-current	45,423	43,432
Total Deferred Revenue	229,735	209,575
Deferred software revenue
Deferred Revenue Arrangement [Line Items]
Deferred revenue, Current	1,305	666
Deferred services revenue
Deferred Revenue Arrangement [Line Items]
Deferred revenue, Current	$183,007	$165,477

Property_and_Equipment_Detail

Property and Equipment (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$168,341	$120,620
Less: Accumulated depreciation and amortization	-28,133	-31,719
Property and equipment, net	140,208	88,901
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,445	0
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	102,880	0
Computers, servers and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	33,914	27,827
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,399	2,409
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,621	8,911
Purchased software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,463	2,291
Construction in process
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$619	$79,182

Property_and_Equipment_Additio

Property and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Property, Plant and Equipment [Line Items]
LIability for contract terminationn	$1,242
Depreciation	8,856	6,207	4,939
Leasehold improvements
Property, Plant and Equipment [Line Items]
Accelerated depreciation	$550

Accrued_Liabilities_Detail

Accrued Liabilities (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Payables and Accruals [Abstract]
Compensation and related payroll taxes	$38,518	$35,813
Other	34,239	40,353
Total accrued liabilities	$72,757	$76,166

Commitments_and_Contingencies_1

Commitments and Contingencies - Future Minimum Lease Payments Under All Operating Leases (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2016	$8,762
2017	4,827
2018	3,993
2019	3,379
2020 and thereafter	6,635
Future minimum lease payments, Total	$27,596

Commitments_and_Contingencies_2

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Rent expenses	$10,845	$11,405	$10,037
Non-cancellable purchase commitments, 2016	9,286
Non-cancellable purchase commitments, 2017	2,759
Non-cancellable purchase commitments, 2018	1,129
Non-cancellable purchase commitments, 2019	254
Non-cancellable purchase commitments, Total for all periods through fiscal 2019	13,428
Royalty expense	$1,768	$1,350	$2,081
Maximum software warranty period, days	90 days

Revolving_Credit_Facility_Deta

Revolving Credit Facility (Details) (Revolving Credit Facility, USD $)	0 Months Ended	12 Months Ended
	Jun. 30, 2014	Mar. 31, 2015	Jun. 30, 2014
Line of Credit Facility [Line Items]
Term (in years)	5 years
Borrowing capacity	$250,000,000	$250,000,000	$250,000,000
Commitment fee percentage	0.25%
Unamortized debt issuance expense		1,072,000
Amortization of debt issuance expense		$190,000
LIBOR
Line of Credit Facility [Line Items]
Variable rate (percent)	1.50%

Capitalization_Detail

Capitalization (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Nov. 13, 2008
				right
Class of Stock [Line Items]
Common stock, shares authorized	250,000,000	250,000,000
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares outstanding	0	0
Number of rights declared as dividend distribution for each outstanding share of common stock				1
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Exercise Purchase price of preferred stock rights	$80
Period before rights become exercisable	10 days
Minimum acquisition percentage of company stock needed for rights to become exercisable	15.00%
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.
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.
Redemption price of each right	$0.00
Expiration date of rights	14-Nov-18
Common stock, shares outstanding	45,122,000	47,094,000
Common stock, par value (in dollars per share)	$0.01	$0.01
Amount of common stock repurchased	$155,125	$50,030	$0
Restricted Stock Units
Class of Stock [Line Items]
Shares reserved for issuance	11,059,000
Common Stock Repurchased
Class of Stock [Line Items]
Amount of common stock repurchased	155,125
Number of shares repurchased	3,171,000
Remaining value of common stock to be repurchased under share repurchase program	$100,002
Series A Junior Participating Preferred
Class of Stock [Line Items]
Preferred stock, shares authorized	150,000
Preferred stock, par value (in dollars per share)	$0.01

Stock_Plans_Additional_Informa

Stock Plans - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2015
	stock_plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans	2			2
Unrecognized stock-based compensation expense	$122,977			$122,977
Awards expected to be recognized over a weighted average period	2 years 6 months 18 days
Weighted average fair value of stock options granted per share (in dollars per share)	$20.16	$41.70	$27.28
Total intrinsic value of options exercised	15,069	59,509	65,973
Total fair value of restricted stock units - vested	24,592	37,584	25,649
Recognized tax benefit related to stock-based compensation	18,570	15,940	8,901
Compensation expense	60,663	49,124	30,098
PSO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vesting period (in years)				3 years 6 months
Fair value of grants				1,012
Number of Awards, Granted				46
PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, vesting period (in years)				3 years 6 months
Fair value of grants				1,041
Number of Awards, Granted				24
Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	902			902
Purchase price as a percentage of fair market value	85.00%
Length of offering period	6 months
Maximum employee payroll percent deduction of salary	10.00%			10.00%
Maximum amount of stock purchasable by employees within a calendar year	25
Number of shares purchased by employees	204
Proceeds received	7,906
Compensation expense	$2,960	$395
Period of expense		2 months
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 | 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
1996 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified stock options grantable	11,705			11,705
Expiration term of stock options granted at the discretion of board from the date of the grant (in years)	10 years
Options available for future grant	572			572
2006 Long-Term Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available for future grant	757			757
Percentage of outstanding shares available for awards under the LTIP as of any April 1st	5.00%			5.00%

Assumptions_Used_in_BlackSchol

Assumptions Used in Black-Scholes Option-Pricing Model (Detail)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility, minimum	41.00%	42.00%	45.00%
Expected volatility, maximum	47.00%	47.00%	50.00%
Weighted average expected volatility	46.00%	45.00%	47.00%
Risk-free interest rates, minimum	1.22%	0.70%	0.60%
Risk-free interest rates, maximum	2.18%	2.11%	1.40%
Weighted average expected life (in years)	5 years 8 months 1 day	6 years 10 months 24 days	6 years 2 months 12 days

Activity_for_Companys_Two_Stoc

Activity for Company's Two Stock Incentive Plans (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Number of Options
Number of Options, Outstanding beginning balance (in shares)	6,388	6,439	6,656
Number of Options, Options granted (in shares)	1,107	1,035	1,289
Number of Options, Options exercised (in shares)	-504	-999	-1,361
Number of Options, Options forfeited (in shares)	-159	-87	-129
Number of Options, Options expired (in shares)	-27	0	-16
Number of Options, Outstanding ending balance (in shares)	6,805	6,388	6,439
Number of Options, Vested or expected to vest at March 31, 2015 (in shares)	6,722
Number of Options, Exercisable at March 31, 2015 (in shares)	4,349
Weighted- Average Exercise Price
Weighted-Average Exercise Price, Outstanding beginning balance (in dollars per share)	$39.03	$28.31	$19.19
Weighted-Average Exercise Price, Options granted (in dollars per share)	$46.16	$85.91	$60.07
Weighted-Average Exercise Price, Options exercised (in dollars per share)	$19.44	$17.62	$13.32
Weighted-Average Exercise Price, Options forfeited (in dollars per share)	$65.93	$50.05	$35.11
Weighted-Average Exercise Price, Options expired (in dollars per share)	$68.84	$0	$11.24
Weighted-Average Exercise Price, Outstanding ending balance (in dollars per share)	$40.89	$39.03	$28.31
Weighted-Average Exercise Price, Vested or expected to vest at March 31, 2015 (in dollars per share)	$40.55
Weighted-Average Exercise Price, Exercisable at March 31, 2015 (in dollars per share)	$30
Weighted- Average Remaining Contractual Term (Years)
Weighted-Average Remaining Contractual Term, Outstanding at March 31, 2015 (years)	6 years 0 months 25 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest at March 31, 2015 (years)	6 years 0 months 3 days
Weighted-Average Remaining Contractual Term, Exercisable at March 31, 2015 (years)	4 years 7 months 13 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding at March 31, 2015	$81,082
Aggregate Intrinsic Value, Vested or expected to vest at March 31, 2015	81,079
Aggregate Intrinsic Value, Exercisable at March 31, 2015	$80,671

Summary_of_Stock_Options_Outst

Summary of Stock Options Outstanding Under Plan and LTIP (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
$4.50 - $13.81
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	$4.50
Range of Exercise Prices, upper range limit	$13.81
Options Outstanding at March 31, 2015	1,562
Weighted-Average Remaining Contractual Life (years)	2 years 2 months 19 days
Weighted-Average Exercise Price (in dollars per share)	$9.63
Options Exercisable at March 31, 2015	1,562
Weighted- Average Exercise Price (in dollars per share)	$9.63
$14.25 - $41.55
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	$14.25
Range of Exercise Prices, upper range limit	$41.55
Options Outstanding at March 31, 2015	2,097
Weighted-Average Remaining Contractual Life (years)	5 years 3 months 29 days
Weighted-Average Exercise Price (in dollars per share)	$30.42
Options Exercisable at March 31, 2015	1,922
Weighted- Average Exercise Price (in dollars per share)	$29.42
$43.30 - $56.57
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	$43.30
Range of Exercise Prices, upper range limit	$56.57
Options Outstanding at March 31, 2015	1,923
Weighted-Average Remaining Contractual Life (years)	8 years 6 months 18 days
Weighted-Average Exercise Price (in dollars per share)	$50.44
Options Exercisable at March 31, 2015	499
Weighted- Average Exercise Price (in dollars per share)	$55.84
$58.25 - $86.64
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	$58.25
Range of Exercise Prices, upper range limit	$86.64
Options Outstanding at March 31, 2015	387
Weighted-Average Remaining Contractual Life (years)	8 years 1 month 9 days
Weighted-Average Exercise Price (in dollars per share)	$76.34
Options Exercisable at March 31, 2015	97
Weighted- Average Exercise Price (in dollars per share)	$78.03
$87.20
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	$87.20
Range of Exercise Prices, upper range limit	$87.20
Options Outstanding at March 31, 2015	836
Weighted-Average Remaining Contractual Life (years)	8 years 5 months 1 day
Weighted-Average Exercise Price (in dollars per share)	$87.20
Options Exercisable at March 31, 2015	269
Weighted- Average Exercise Price (in dollars per share)	$87.20
$ 4.50 - $87.20
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range limit	$4.50
Range of Exercise Prices, upper range limit	$87.20
Options Outstanding at March 31, 2015	6,805
Weighted-Average Remaining Contractual Life (years)	6 years 0 months 25 days
Weighted-Average Exercise Price (in dollars per share)	$40.89
Options Exercisable at March 31, 2015	4,349
Weighted- Average Exercise Price (in dollars per share)	$30

Restricted_Stock_Unit_Activity

Restricted Stock Unit Activity (Detail) (Restricted Stock Units, USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Restricted Stock Units
Number of Awards
Number of Awards, Non-vested beginning balance	1,202	1,198	1,113
Number of Awards, Granted	791	562	613
Number of Awards, Vested	-491	-473	-442
Number of Awards, Forfeited	-114	-85	-86
Number of Awards, Non-vested ending balance	1,388	1,202	1,198
Weighted Average Grant Date Fair Value
Weighted Average grant Date Fair Value, Non-vested beginning balance (in dollars per share)	$65.63	$46.45	$33.24
Weighted Average grant Date Fair Value, Granted (in dollars per share)	$46.69	$84.66	$57.01
Weighted Average grant Date Fair Value, Vested (in dollars per share)	$59.22	$42.11	$29.79
Weighted Average grant Date Fair Value, Forfeited (in dollars per share)	$63.70	$53.57	$37.49
Weighted Average grant Date Fair Value, Non-vested ending balance (in dollars per share)	$57.04	$65.63	$46.45

StockBased_Compensation_Expens

Stock-Based Compensation Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$60,663	$49,124	$30,098
Cost of services revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,930	1,428	963
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	26,853	20,813	13,508
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	5,908	4,512	3,020
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$24,972	$22,371	$12,607

Income_Taxes_Components_of_Inc

Income Taxes - Components of Income Before Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Domestic	$28,048	$89,946	$72,650
Foreign	10,844	11,364	9,304
Income before income taxes	$38,892	$101,310	$81,954

Income_Taxes_Components_of_Inc1

Income Taxes - Components of Income Tax Expense (Benefit) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Current:
Federal	$1,777	$34,406	$23,537
State	2,533	4,063	2,238
Foreign	4,791	5,207	5,073
Deferred:
Federal	4,237	-5,453	-1,107
State	-24	-616	18
Foreign	-72	-361	-1,014
Income tax expense (benefit)	$13,242	$37,246	$28,745

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Statutory Tax Rates and Effective Tax Rates (Detail)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax expense rate	35.00%	35.00%	35.00%
State and local income tax expense, net of federal income tax effect	3.00%	2.50%	2.50%
Impact of limit on executive compensation	3.20%	1.50%	0.80%
Foreign earnings taxed at different rates	1.00%	0.70%	0.40%
Domestic permanent differences	4.10%	0.30%	1.10%
Foreign tax credits	-2.80%	-1.30%	-1.40%
Research credits	-4.90%	-1.90%	-3.00%
Tax reserves	-5.30%	-0.80%	0.10%
Other differences, net	0.70%	0.80%	-0.40%
Effective income tax expense	34.00%	36.80%	35.10%

Income_Taxes_Components_of_Def

Income Taxes - Components of Deferred Tax Assets (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Deferred tax assets:
Stock-based compensation	$30,561	$23,261
Deferred revenue	10,542	9,266
Tax credits	6,229	10,268
Accrued expenses	1,570	1,240
Allowance for doubtful accounts and other reserves	697	943
Net operating losses	26	724
Depreciation and amortization	0	2,383
Less: valuation allowance	-1,343	-1,382
Total deferred tax assets	48,282	46,703
Deferred tax liabilities:
Depreciation and amortization	-7,237	0
Net deferred tax asset	$41,045	$46,703

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Valuation allowances against deferred tax assets	$1,343	$1,382
Valuation allowance against research tax credits	1,343
Cumulative unremitted foreign earnings	18,659
Excess tax benefit related to share-based payments	2,141	28,416
Unrecognized Tax Benefits
Unrecognized tax benefits which would favorably affect the effective tax rate once recognized	2,005	4,113	4,570	4,699
Accrued interest and penalties	401
Federal Alternative Minimum Tax credit carryforwards	1,149
Reasonably possible amount of currently remaining unrecognized tax benefits	76
Interest and penalties	224	89	107
New Jersey | Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	4,203
New Jersey | Research Tax Credit Carryforward | Minimum
Tax Credit Carryforward [Line Items]
Tax credit carryforward, expiration year	2016
New Jersey | Research Tax Credit Carryforward | Maximum
Tax Credit Carryforward [Line Items]
Tax credit carryforward, expiration year	2023
U.S. Federal | Research Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	2,601
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	2035
Other Liabilities
Unrecognized Tax Benefits
Unrecognized tax benefits which would favorably affect the effective tax rate once recognized	1,634
Accrued interest and penalties	333
Deferred Tax Assets
Unrecognized Tax Benefits
Unrecognized tax benefits which would favorably affect the effective tax rate once recognized	771
Accrued interest and penalties	$68

Income_Taxes_Schedule_of_Tax_Y

Income Taxes - Schedule of Tax Years Subject to Income Tax Examination (Detail)	12 Months Ended
	Mar. 31, 2015
U.S. Federal | Minimum
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2005
U.S. Federal | Maximum
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2015
New Jersey | Minimum
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2002
New Jersey | Maximum
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2015
Foreign jurisdictions | Minimum
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2004
Foreign jurisdictions | Maximum
Income Tax Examination [Line Items]
Tax Years Subject to Income Tax Examination	2015

Income_Taxes_Reconciliation_of1

Income Taxes - Reconciliation of Amounts of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$4,113	$4,570	$4,699
Additions for current year tax positions	490	316	401
Additions for tax positions related to prior years	252	433	0
Settlements and effective settlements with tax authorities and remeasurements	-2,838	-1,283	-511
Reductions related to the expiration of statutes of limitations	0	0	0
Reductions related to foreign currency translation adjustment	-12		-19
Additions related to foreign currency translation adjustment		77
Ending balance	$2,005	$4,113	$4,570

Employee_Benefit_Plan_Addition

Employee Benefit Plan - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Postemployment Benefits [Abstract]
Company contributions to defined contribution plan	$1,955	$1,451	$1,132

Segment_Information_Additional

Segment Information - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
	segment
Segment Reporting [Abstract]
Number of Reportable Segments	1
Segment Reporting Information [Line Items]
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%

Segment_Information_Schedule_o

Segment Information - Schedule of Revenue by Geographic Area (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$150,735	$153,021	$151,144	$152,643	$156,819	$153,250	$141,863	$134,408	$607,543	$586,340	$495,850
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									344,931	333,700	288,370
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									$262,612	$252,640	$207,480

Segment_Information_Schedule_o1

Segment Information - Schedule of Long-Lived Assets by Geographic Area (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	$147,012	$96,116
United States
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	143,975	89,523
Other
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	$3,037	$6,593

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data (unaudited) (Detail) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$150,735		$153,021		$151,144		$152,643		$156,819		$153,250		$141,863		$134,408		$607,543	$586,340	$495,850
Gross margin	129,821		133,080		130,858		131,716		136,950		134,752		123,707		116,630		525,475	512,039	430,898
Net income	$3,352		$3,073		$6,496		$12,729		$15,657		$17,591		$17,354		$13,462		$25,650	$64,064	$53,209
Net income per common share:
Basic (in dollars per share)	$0.07	[1]	$0.07	[1]	$0.14	[1]	$0.28	[1]	$0.33	[1]	$0.37	[1]	$0.37	[1]	$0.29	[1]	$0.56	$1.36	$1.17
Diluted (in dollars per share)	$0.07	[1]	$0.07	[1]	$0.14	[1]	$0.27	[1]	$0.32	[1]	$0.35	[1]	$0.35	[1]	$0.27	[1]	$0.54	$1.29	$1.10
[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.

Schedule_II_Valuation_and_Qual1

Schedule II - Valuation and Qualifying Accounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$111	$103	$97
Charged (Credited) to Costs and Expenses	1	8	12
Deductions	8	0	6
Balance at End of Year	104	111	103
Valuation Allowance for Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,382	1,395	1,420
Charged (Credited) to Costs and Expenses	-39	0	0
Deductions	0	13	25
Balance at End of Year	$1,343	$1,382	$1,395