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Stock Options Outstanding (Detail)
9 Months Ended
Dec. 31, 2019
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Options Outstanding, Number of Shares Outstanding | shares 1,162,679
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 6 years 1 month 13 days
Options Outstanding, Weighted-Average Exercise Price $ 80.25
Options Exercisable , Number of Shares Outstanding | shares 732,860
Options Exercisable, Weighted-Average Exercise Price $ 73.27
$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 (in years) 1 year 7 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 57,728
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 2 years 5 months 16 days
Options Outstanding, Weighted-Average Exercise Price $ 34.03
Options Exercisable , Number of Shares Outstanding | shares 57,728
Options Exercisable, Weighted-Average Exercise Price $ 34.03
$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 272,834
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 5 years 6 months 11 days
Options Outstanding, Weighted-Average Exercise Price $ 72.22
Options Exercisable , Number of Shares Outstanding | shares 201,712
Options Exercisable, Weighted-Average Exercise Price $ 71.84
$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 766,205
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 6 years 11 months 27 days
Options Outstanding, Weighted-Average Exercise Price $ 91.49
Options Exercisable , Number of Shares Outstanding | shares 407,508
Options Exercisable, Weighted-Average Exercise Price $ 87.63