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Stock Options Outstanding (Detail)
3 Months Ended
Jun. 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 1,376,037
Outstanding Options, Weighted-Average Remaining Contractual Life 7 years 11 days
Outstanding Options, Weighted-Average Exercise Price $ 70.00
Exercisable Options, Number of Shares Outstanding | shares 970,765
Exercisable Options, Weighted-Average Exercise Price $ 64.25
$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 107,435
Outstanding Options, Weighted-Average Remaining Contractual Life 3 years 4 months 20 days
Outstanding Options, Weighted-Average Exercise Price $ 24.52
Exercisable Options, Number of Shares Outstanding | shares 107,435
Exercisable Options, Weighted-Average Exercise Price $ 24.52
$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 177,333
Outstanding Options, Weighted-Average Remaining Contractual Life 4 years 11 months 15 days
Outstanding Options, Weighted-Average Exercise Price $ 33.88
Exercisable Options, Number of Shares Outstanding | shares 174,333
Exercisable Options, Weighted-Average Exercise Price $ 33.82
$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 426,216
Outstanding Options, Weighted-Average Remaining Contractual Life 7 years 3 months 22 days
Outstanding Options, Weighted-Average Exercise Price $ 70.05
Exercisable Options, Number of Shares Outstanding | shares 270,173
Exercisable Options, Weighted-Average Exercise Price $ 68.49
$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 665,053
Outstanding Options, Weighted-Average Remaining Contractual Life 7 years 11 months 26 days
Outstanding Options, Weighted-Average Exercise Price $ 86.94
Exercisable Options, Number of Shares Outstanding | shares 418,824
Exercisable Options, Weighted-Average Exercise Price $ 84.36