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Common Stock and Stock Plans - Summary of Employee Stock Option Activity and TSR Performance Stock Option Activity (Detail) $ / shares in Units, $ in Thousands | 12 Months Ended
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Mar. 31, 2019 USD ($) $ / shares shares
Employee Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Outstanding, Beginning Balance | shares | 1,766,500
Number of Shares, Options granted | shares | 40,000
Number of Shares, Options exercised | shares | (275,000)
Number of Shares, Outstanding, Ending Balance | shares | 1,531,500
Number of Shares, Vested and exercisable, Ending Balance | shares | 1,164,250
Weighted Average Exercise Price per Share, Outstanding, Beginning Balance | $ / shares | $ 61.13
Weighted Average Exercise Price per Share, Options granted | $ / shares | 61.60
Weighted Average Exercise Price per Share, Options exercised | $ / shares | 40.32
Weighted Average Exercise Price per Share, Outstanding, Ending Balance | $ / shares | 64.87
Weighted Average Exercise Price per Share, Vested and exercisable, Ending Balance | $ / shares | $ 64.34
Weighted Average Remaining Contractual Term in Years, Outstanding | 2 years 6 months 18 days
Weighted Average Remaining Contractual Term in Years, Vested and exercisable | 2 years 2 months 19 days
Aggregate Intrinsic Value, Outstanding | $ | $ 19,337
Aggregate Intrinsic Value, Vested and exercisable | $ | $ 15,321
TSR Performance Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Outstanding, Beginning Balance | shares | 497,500
Number of Shares, Options granted | shares | 530,000
Number of Shares, Outstanding, Ending Balance | shares | 1,027,500
Weighted Average Exercise Price per Share, Outstanding, Beginning Balance | $ / shares | $ 73.77
Weighted Average Exercise Price per Share, Options granted | $ / shares | 69.05
Weighted Average Exercise Price per Share, Outstanding, Ending Balance | $ / shares | $ 71.34
Weighted Average Remaining Contractual Term in Years, Outstanding | 5 years 1 month 24 days
Aggregate Intrinsic Value, Outstanding | $ | $ 6,334

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