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Stock Options Outstanding (Detail)
9 Months Ended
Dec. 31, 2020
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Options Outstanding, Number of Shares Outstanding | shares 1,157,056
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 6 years 29 days
Options Outstanding, Weighted-Average Exercise Price $ 80.68
Options Exercisable , Number of Shares Outstanding | shares 747,796
Options Exercisable, Weighted-Average Exercise Price $ 81.08
$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 18,931
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 7 months 2 days
Options Outstanding, Weighted-Average Exercise Price $ 23.21
Options Exercisable , Number of Shares Outstanding | shares 18,931
Options Exercisable, Weighted-Average Exercise Price $ 23.21
$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 37,456
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 1 year 5 months 12 days
Options Outstanding, Weighted-Average Exercise Price $ 34.21
Options Exercisable , Number of Shares Outstanding | shares 37,456
Options Exercisable, Weighted-Average Exercise Price $ 34.21
$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 377,009
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 6 years 10 months 28 days
Options Outstanding, Weighted-Average Exercise Price $ 66.82
Options Exercisable , Number of Shares Outstanding | shares 185,657
Options Exercisable, Weighted-Average Exercise Price $ 72.92
$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 723,660
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 6 years 10 days
Options Outstanding, Weighted-Average Exercise Price $ 91.81
Options Exercisable , Number of Shares Outstanding | shares 505,752
Options Exercisable, Weighted-Average Exercise Price $ 89.71