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Stock Option Activity (Detail)
 6 Months Ended
Sep. 30, 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 (432,264)
Number of Shares, Cancelled | shares (18,662)
Number of Shares, Outstanding Options at End of Period | shares 1,559,201
Number of Shares, Options Exercisable at End of Period | shares 1,043,635
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 32.92
Weighted-Average Exercise Price, Cancelled 69.82
Weighted-Average Exercise Price, Outstanding Options at End of Period 61.27
Weighted-Average Exercise Price, Options Exercisable at End of Period $ 53.01