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Stock Options Outstanding (Detail)
12 Months Ended
Mar. 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 1,042,925
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 2 months 4 days
Options Outstanding, Weighted-Average Exercise Price $ 76.88
Options Exercisable , Number of Shares Outstanding | shares 761,564
Options Exercisable, Weighted-Average Exercise Price $ 71.13
$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 4 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 81,288
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 2 months 15 days
Options Outstanding, Weighted-Average Exercise Price $ 33.99
Options Exercisable , Number of Shares Outstanding | shares 81,288
Options Exercisable, Weighted-Average Exercise Price $ 33.99
$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 303,163
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 2 months 12 days
Options Outstanding, Weighted-Average Exercise Price $ 71.34
Options Exercisable , Number of Shares Outstanding | shares 219,673
Options Exercisable, Weighted-Average Exercise Price $ 70.69
$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 3 days
Options Outstanding, Weighted-Average Exercise Price $ 91.55
Options Exercisable , Number of Shares Outstanding | shares 394,691
Options Exercisable, Weighted-Average Exercise Price $ 87.02