XML 90 R72.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock Options Outstanding (Detail)
12 Months Ended
Mar. 31, 2018
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Options Outstanding, Number of Shares Outstanding | shares 958,136
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 7 months 24 days
Options Outstanding, Weighted-Average Exercise Price $ 72.52
Options Exercisable , Number of Shares Outstanding | shares 651,218
Options Exercisable, Weighted-Average Exercise Price $ 66.53
$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 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 99,582
Options Outstanding, Weighted-Average Remaining Contractual Life 4 years 2 months 15 days
Options Outstanding, Weighted-Average Exercise Price $ 33.94
Options Exercisable , Number of Shares Outstanding | shares 99,582
Options Exercisable, Weighted-Average Exercise Price $ 33.94
$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 307,424
Options Outstanding, Weighted-Average Remaining Contractual Life 7 years
Options Outstanding, Weighted-Average Exercise Price $ 71.12
Options Exercisable , Number of Shares Outstanding | shares 183,248
Options Exercisable, Weighted-Average Exercise Price $ 69.79
$79.73 - $ 106.00 [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 $ 106.00
Options Outstanding, Number of Shares Outstanding | shares 485,218
Options Outstanding, Weighted-Average Remaining Contractual Life 7 years 4 months 13 days
Options Outstanding, Weighted-Average Exercise Price $ 88.02
Options Exercisable , Number of Shares Outstanding | shares 302,476
Options Exercisable, Weighted-Average Exercise Price $ 84.72