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Stock Options Outstanding (Detail)
3 Months Ended
Jun. 30, 2018
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Options Outstanding, Number of Shares Outstanding | shares 1,034,478
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 9 months 29 days
Options Outstanding, Weighted-Average Exercise Price $ 76.74
Options Exercisable , Number of Shares Outstanding | shares 696,466
Options Exercisable, Weighted-Average Exercise Price $ 69.08
$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 65,912
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 1 month 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 84,582
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years 11 months 15 days
Options Outstanding, Weighted-Average Exercise Price $ 33.98
Options Exercisable , Number of Shares Outstanding | shares 84,582
Options Exercisable, Weighted-Average Exercise Price $ 33.98
$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 293,163
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 9 months 25 days
Options Outstanding, Weighted-Average Exercise Price $ 71.27
Options Exercisable , Number of Shares Outstanding | shares 188,311
Options Exercisable, Weighted-Average Exercise Price $ 70.56
$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 590,821
Options Outstanding, Weighted-Average Remaining Contractual Life 7 years 7 months 28 days
Options Outstanding, Weighted-Average Exercise Price $ 91.53
Options Exercisable , Number of Shares Outstanding | shares 357,661
Options Exercisable, Weighted-Average Exercise Price $ 85.05