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Stock Options Outstanding (Detail)
6 Months Ended
Sep. 30, 2017
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Outstanding Options, Number of Shares Outstanding | shares 1,037,948
Outstanding Options, Weighted-Average Remaining Contractual Life 7 years 1 month 10 days
Outstanding Options, Weighted-Average Exercise Price $ 72.49
Exercisable Options, Number of Shares Outstanding | shares 635,676
Exercisable Options, Weighted-Average Exercise Price $ 65.13
$23.17 - $29.84 [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 $ 29.84
Outstanding Options, Number of Shares Outstanding | shares 69,110
Outstanding Options, Weighted-Average Remaining Contractual Life 3 years 10 months 3 days
Outstanding Options, Weighted-Average Exercise Price $ 23.47
Exercisable Options, Number of Shares Outstanding | shares 69,110
Exercisable Options, Weighted-Average Exercise Price $ 23.47
$33.43 - $ 37.34 [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 $ 37.34
Outstanding Options, Number of Shares Outstanding | shares 108,582
Outstanding Options, Weighted-Average Remaining Contractual Life 4 years 8 months 16 days
Outstanding Options, Weighted-Average Exercise Price $ 33.93
Exercisable Options, Number of Shares Outstanding | shares 108,582
Exercisable Options, Weighted-Average Exercise Price $ 33.93
$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 320,137
Outstanding Options, Weighted-Average Remaining Contractual Life 7 years 5 months 12 days
Outstanding Options, Weighted-Average Exercise Price $ 70.94
Exercisable Options, Number of Shares Outstanding | shares 164,094
Exercisable Options, Weighted-Average Exercise Price $ 69.22
$79.73 - $ 106.00 [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 $ 106.00
Outstanding Options, Number of Shares Outstanding | shares 540,119
Outstanding Options, Weighted-Average Remaining Contractual Life 7 years 9 months 25 days
Outstanding Options, Weighted-Average Exercise Price $ 87.43
Exercisable Options, Number of Shares Outstanding | shares 293,890
Exercisable Options, Weighted-Average Exercise Price $ 84.18