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Stock Options Outstanding (Detail)
6 Months Ended
Sep. 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 1,559,201
Outstanding Options, Weighted-Average Remaining Contractual Life 6 years 11 months 27 days
Outstanding Options, Weighted-Average Exercise Price $ 53.01
Exercisable Options, Number of Shares Outstanding | shares 1,043,635
Exercisable Options, Weighted-Average Exercise Price $ 53.01
$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 279,429
Outstanding Options, Weighted-Average Remaining Contractual Life 3 years 9 months
Outstanding Options, Weighted-Average Exercise Price $ 25.91
Exercisable Options, Number of Shares Outstanding | shares 278,429
Exercisable Options, Weighted-Average Exercise Price $ 25.90
$33.08 - $ 37.95 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range 33.08
Range of Exercise Prices, Upper Range $ 37.95
Outstanding Options, Number of Shares Outstanding | shares 254,876
Outstanding Options, Weighted-Average Remaining Contractual Life 5 years 8 months 16 days
Outstanding Options, Weighted-Average Exercise Price $ 33.92
Exercisable Options, Number of Shares Outstanding | shares 248,876
Exercisable Options, Weighted-Average Exercise Price $ 33.87
$53.22 - $ 74.10 [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 $ 74.10
Outstanding Options, Number of Shares Outstanding | shares 451,080
Outstanding Options, Weighted-Average Remaining Contractual Life 8 years 18 days
Outstanding Options, Weighted-Average Exercise Price $ 69.99
Exercisable Options, Number of Shares Outstanding | shares 232,467
Exercisable Options, Weighted-Average Exercise Price $ 67.18
$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 573,816
Outstanding Options, Weighted-Average Remaining Contractual Life 8 years 3 months 18 days
Outstanding Options, Weighted-Average Exercise Price $ 83.79
Exercisable Options, Number of Shares Outstanding | shares 283,863
Exercisable Options, Weighted-Average Exercise Price $ 84.79