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Stock Option Activity (Detail)
 6 Months Ended
Sep. 30, 2015
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Outstanding Options at Beginning of Period | shares 1,665,565
Number of Shares, Granted | shares 293,572
Number of Shares, Exercised | shares (97,410)
Number of Shares, Cancelled | shares (15,000)
Number of Shares, Outstanding Options at End of Period | shares 1,846,727
Number of Shares, Options Exercisable at End of Period | shares 1,252,675
Weighted-Average Exercise Price, Weighted-Average Fair Value of Options Granted during the Period $ 24.76
Weighted-Average Exercise Price, Outstanding Options at Beginning of Period 46.37
Weighted-Average Exercise Price, Granted 81.48
Weighted-Average Exercise Price, Exercised 26.47
Weighted-Average Exercise Price, Cancelled 86.35
Weighted-Average Exercise Price, Outstanding Options at End of Period 52.68
Weighted-Average Exercise Price, Options Exercisable at End of Period $ 40.29