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Stock Options Outstanding (Detail)
6 Months Ended
Sep. 30, 2019
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Options Outstanding, Number of Shares Outstanding | shares 1,182,440
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 6 years 4 months 9 days
Options Outstanding, Weighted-Average Exercise Price $ 79.94
Options Exercisable , Number of Shares Outstanding | shares 776,586
Options Exercisable, Weighted-Average Exercise Price $ 73.31
$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 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 57,728
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 2 years 8 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 292,595
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 5 years 9 months 7 days
Options Outstanding, Weighted-Average Exercise Price $ 71.51
Options Exercisable , Number of Shares Outstanding | shares 228,423
Options Exercisable, Weighted-Average Exercise Price $ 71.35
$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) 7 years 3 months
Options Outstanding, Weighted-Average Exercise Price $ 91.49
Options Exercisable , Number of Shares Outstanding | shares 424,523
Options Exercisable, Weighted-Average Exercise Price $ 87.47