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Stock Options Outstanding (Detail)
3 Months Ended
Jun. 30, 2016
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Outstanding Options, Number of Shares Outstanding | shares 1,645,052
Outstanding Options, Weighted-Average Remaining Contractual Life 6 years 11 months 5 days
Outstanding Options, Weighted-Average Exercise Price $ 59.15
Exercisable Options, Number of Shares Outstanding | shares 1,060,879
Exercisable Options, Weighted-Average Exercise Price $ 49.56
$23.17 - $ 30.74 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range 23.17
Range of Exercise Prices, Upper Range $ 30.74
Outstanding Options, Number of Shares Outstanding | shares 349,570
Outstanding Options, Weighted-Average Remaining Contractual Life 3 years 6 months 29 days
Outstanding Options, Weighted-Average Exercise Price $ 25.90
Exercisable Options, Number of Shares Outstanding | shares 348,570
Exercisable Options, Weighted-Average Exercise Price $ 25.89
$33.43 - $ 37.95 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range 33.43
Range of Exercise Prices, Upper Range $ 37.95
Outstanding Options, Number of Shares Outstanding | shares 281,973
Outstanding Options, Weighted-Average Remaining Contractual Life 5 years 9 months 4 days
Outstanding Options, Weighted-Average Exercise Price $ 34.05
Exercisable Options, Number of Shares Outstanding | shares 272,973
Exercisable Options, Weighted-Average Exercise Price $ 33.97
$53.22 - $ 77.67 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range 53.22
Range of Exercise Prices, Upper Range $ 77.67
Outstanding Options, Number of Shares Outstanding | shares 455,765
Outstanding Options, Weighted-Average Remaining Contractual Life 8 years 3 months 15 days
Outstanding Options, Weighted-Average Exercise Price $ 69.93
Exercisable Options, Number of Shares Outstanding | shares 171,545
Exercisable Options, Weighted-Average Exercise Price $ 67.07
$79.73 - $ 93.56 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range 79.73
Range of Exercise Prices, Upper Range $ 93.56
Outstanding Options, Number of Shares Outstanding | shares 557,744
Outstanding Options, Weighted-Average Remaining Contractual Life 8 years 6 months
Outstanding Options, Weighted-Average Exercise Price $ 83.88
Exercisable Options, Number of Shares Outstanding | shares 267,791
Exercisable Options, Weighted-Average Exercise Price $ 85.04