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Stock Option Activity (Detail)
 6 Months Ended
Sep. 30, 2017
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Outstanding Options at Beginning of Period | shares 1,323,379
Number of Shares, Granted | shares 119,986
Number of Shares, Exercised | shares (388,675)
Number of Shares, Cancelled | shares (16,742)
Number of Shares, Outstanding Options at End of Period | shares 1,037,948
Number of Shares, Options Exercisable at End of Period | shares 635,676
Weighted Average Fair Value of Options Granted during the Period $ 33.37
Weighted-Average Exercise Price, Outstanding Options at Beginning of Period 66.07
Weighted-Average Exercise Price, Granted 100.20
Weighted-Average Exercise Price, Exercised 58.95
Weighted-Average Exercise Price, Cancelled 78.05
Weighted-Average Exercise Price, Outstanding Options at End of Period 72.49
Weighted-Average Exercise Price, Options Exercisable at End of Period $ 65.13