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Common Stock and Stock Plans - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost charged against income | $ 79,599,000 | $ 68,545,000 | $ 55,775,000 |
Compensation costs capitalized | $ 11,900,000 | $ 8,000,000.0 | $ 6,600,000 |
Employee Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 2 months 12 days |  |  |
Award vesting period | 4 years |  |  |
Award contractual term | 6 years |  |  |
Weighted average estimated fair value of employee stock options granted | $ 18.35 | $ 19.86 | $ 23.62 |
Stock options exercised intrinsic value | $ 7,900,000 | $ 5,200,000 | $ 8,300,000 |
Tax benefit from stock options exercised |  |  | 0 |
Total Shareholder Return Performance Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Plan description | During the third quarter of fiscal year 2018, the Company began granting TSR performance stock options to executive officers under the 1996 Equity Participation Plan. The number of shares of TSR performance stock options that will become eligible to vest based on the time-based vesting schedule described below is based on a comparison over a four-year performance period of the Company’s TSR to the TSR of the companies included in the S&P Mid Cap 400 Index. The number of options that may become vested and exercisable will range from 0% to 175% of the target number of options based on the Company’s relative TSR ranking for the performance period. The Company’s TSR performance stock options have a four-year time-based vesting schedule and a six year contractual term. The TSR performance stock options must be vested under both the time-based vesting schedule and the performance-based vesting conditions in order to become exercisable. Expense for TSR performance stock options that time-vest is recognized regardless of the actual TSR outcome achieved and is recognized on a graded-vesting basis. |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 10 months 24 days |  |  |
Award vesting period | 4 years |  |  |
Award contractual term | 6 years |  |  |
Weighted average estimated fair value of employee stock options granted | $ 32.32 | $ 32.04 |  |
Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost charged against income | $ 58,800,000 | $ 54,000,000.0 | $ 44,900,000 |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years 7 months 6 days |  |  |
Award vesting period | 4 years |  |  |
Weighted average estimated fair value of restricted stock units granted | $ 67.88 | $ 72.89 | $ 69.99 |
Total fair value of shares vested related to restricted stock units | $ 81,100,000 | $ 64,600,000 | $ 58,400,000 |
Equity Participation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum number of shares reserved for issuance |  |  |  | 31,850,000
Plan description | Shares of the Company’s common stock granted under the Equity Participation Plan as an award other than as an option or as a stock appreciation right with a per share purchase price lower than 100% of fair market value on the date of grant are counted against the Equity Participation Plan share reserve as two shares for each share of common stock prior to September 22, 2010 and subsequent to September 19, 2012, and as 2.65 shares for each share of common stock during the period beginning on September 22, 2010 and ending on September 19, 2012. |  |  |
Compensation cost charged against income | $ 75,300,000 | 65,100,000 | 52,600,000 |
Unrecognized compensation cost related to unvested stock-based compensation arrangements | $ 186,600,000 |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum number of shares reserved for issuance | 3,650,000 |  |  |
Discount on the fair market value of common stock purchased under the Employee Stock Purchase Plan | 85.00% |  |  |
Compensation cost charged against income | $ 4,300,000 | $ 3,400,000 | $ 3,100,000 |
Unrecognized compensation cost related to unvested stock-based compensation arrangements | $ 1,300,000 |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 6 months |  |  |
Weighted average estimated fair value of employee stock purchase plan shares issued | $ 15.14 | $ 15.09 | $ 16.27 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109196918&loc=d3e11374-113907 + Details
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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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