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Stock Options Outstanding (Detail)
6 Months Ended
Sep. 30, 2020
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Options Outstanding, Number of Shares Outstanding | shares 1,285,424
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 6 years 21 days
Options Outstanding, Weighted-Average Exercise Price $ 79.17
Options Exercisable , Number of Shares Outstanding | shares 873,164
Options Exercisable, Weighted-Average Exercise Price $ 78.74
$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 39,165
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 10 months 2 days
Options Outstanding, Weighted-Average Exercise Price $ 23.19
Options Exercisable , Number of Shares Outstanding | shares 39,165
Options Exercisable, Weighted-Average Exercise Price $ 23.19
$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 42,956
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 1 year 8 months 12 days
Options Outstanding, Weighted-Average Exercise Price $ 34.14
Options Exercisable , Number of Shares Outstanding | shares 42,956
Options Exercisable, Weighted-Average Exercise Price $ 34.14
$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 446,709
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 6 years 8 months 19 days
Options Outstanding, Weighted-Average Exercise Price $ 67.55
Options Exercisable , Number of Shares Outstanding | shares 255,357
Options Exercisable, Weighted-Average Exercise Price $ 72.53
$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 756,594
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 6 years 2 months 8 days
Options Outstanding, Weighted-Average Exercise Price $ 91.49
Options Exercisable , Number of Shares Outstanding | shares 535,686
Options Exercisable, Weighted-Average Exercise Price $ 89.34