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Stock Option Activity (Detail)
9 Months Ended
Dec. 31, 2016
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Outstanding Options at Beginning of Period | shares 1,817,763
Number of Shares, Granted | shares 192,364
Number of Shares, Exercised | shares (619,345)
Number of Shares, Cancelled | shares (19,182)
Number of Shares, Outstanding Options at End of Period | shares 1,371,600
Number of Shares, Options Exercisable at End of Period | shares 871,840
Weighted-Average Exercise Price, Weighted-Average Fair Value of Options Granted during the Period $ 24.56
Weighted-Average Exercise Price, Outstanding Options at Beginning of Period 53.03
Weighted-Average Exercise Price, Granted 76.29
Weighted-Average Exercise Price, Exercised 34.51
Weighted-Average Exercise Price, Cancelled 70.30
Weighted-Average Exercise Price, Outstanding Options at End of Period 64.41
Weighted-Average Exercise Price, Options Exercisable at End of Period $ 56.57