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Common Stock and Stock Plans - Summary of Employee Stock Option Activity and TSR Performance Stock Option Activity (Detail)
12 Months Ended
Mar. 31, 2020
$ / shares
shares
Employee Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance | shares 1,531,500
Number of Shares, Options granted | shares 39,000
Number of Shares, Options canceled | shares (5,000)
Number of Shares, Options exercised | shares (340,267)
Number of Shares, Outstanding, Ending Balance | shares 1,225,233
Number of Shares, Vested and exercisable, Ending Balance | shares 1,076,983
Weighted Average Exercise Price per Share, Outstanding, Beginning Balance | $ / shares $ 64.87
Weighted Average Exercise Price per Share, Options granted | $ / shares 74.64
Weighted Average Exercise Price per Share, Options canceled | $ / shares 77.47
Weighted Average Exercise Price per Share, Options exercised | $ / shares 61.89
Weighted Average Exercise Price per Share, Outstanding, Ending Balance | $ / shares 65.96
Weighted Average Exercise Price per Share, Vested and exercisable, Ending Balance | $ / shares $ 65.30
Weighted Average Remaining Contractual Term in Years, Outstanding 1 year 10 months 28 days
Weighted Average Remaining Contractual Term in Years, Vested and exercisable 1 year 8 months 15 days
TSR Performance Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance | shares 1,027,500
Number of Shares, Options granted | shares 603,306
Number of Shares, Outstanding, Ending Balance | shares 1,630,806
Weighted Average Exercise Price per Share, Outstanding, Beginning Balance | $ / shares $ 71.34
Weighted Average Exercise Price per Share, Options granted | $ / shares 71.83
Weighted Average Exercise Price per Share, Outstanding, Ending Balance | $ / shares $ 71.52
Weighted Average Remaining Contractual Term in Years, Outstanding 4 years 8 months 12 days