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Stock Options Outstanding (Detail)
6 Months Ended
Sep. 30, 2018
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Options Outstanding, Number of Shares Outstanding | shares 1,036,219
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 7 months 17 days
Options Outstanding, Weighted-Average Exercise Price $ 76.77
Options Exercisable , Number of Shares Outstanding | shares 698,207
Options Exercisable, Weighted-Average Exercise Price $ 69.16
$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
Options Outstanding, Number of Shares Outstanding | shares 65,912
Options Outstanding, Weighted-Average Remaining Contractual Life 2 years 10 months 6 days
Options Outstanding, Weighted-Average Exercise Price $ 23.27
Options Exercisable , Number of Shares Outstanding | shares 65,912
Options Exercisable, Weighted-Average Exercise Price $ 23.27
$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
Options Outstanding, Number of Shares Outstanding | shares 84,582
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 8 months 15 days
Options Outstanding, Weighted-Average Exercise Price $ 33.98
Options Exercisable , Number of Shares Outstanding | shares 84,582
Options Exercisable, Weighted-Average Exercise Price $ 33.98
$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
Options Outstanding, Number of Shares Outstanding | shares 293,163
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 6 months 25 days
Options Outstanding, Weighted-Average Exercise Price $ 71.27
Options Exercisable , Number of Shares Outstanding | shares 188,311
Options Exercisable, Weighted-Average Exercise Price $ 70.56
$79.73 - $ 106.24 [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 $ 106.24
Options Outstanding, Number of Shares Outstanding | shares 592,562
Options Outstanding, Weighted-Average Remaining Contractual Life 7 years 6 months
Options Outstanding, Weighted-Average Exercise Price $ 91.55
Options Exercisable , Number of Shares Outstanding | shares 359,402
Options Exercisable, Weighted-Average Exercise Price $ 85.12