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Stock Option Activity (Detail)
 3 Months Ended
Jun. 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 174,470
Number of Shares, Exercised | shares (330,341)
Number of Shares, Cancelled | shares (16,840)
Number of Shares, Outstanding Options at End of Period | shares 1,645,052
Number of Shares, Options Exercisable at End of Period | shares 1,060,879
Weighted-Average Exercise Price, Weighted-Average Fair Value of Options Granted during the Period $ 24.42
Weighted-Average Exercise Price, Outstanding Options at Beginning of Period 53.03
Weighted-Average Exercise Price, Granted 75.78
Weighted-Average Exercise Price, Exercised 33.70
Weighted-Average Exercise Price, Cancelled 67.92
Weighted-Average Exercise Price, Outstanding Options at End of Period 59.15
Weighted-Average Exercise Price, Options Exercisable at End of Period $ 49.56