XML 66 R52.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock Options Outstanding (Detail)
9 Months Ended
Dec. 31, 2017
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Outstanding Options, Number of Shares Outstanding | shares 984,932
Outstanding Options, Weighted-Average Remaining Contractual Life 6 years 10 months 24 days
Outstanding Options, Weighted-Average Exercise Price $ 72.76
Exercisable Options, Number of Shares Outstanding | shares 597,945
Exercisable Options, Weighted-Average Exercise Price $ 65.18
$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
Outstanding Options, Number of Shares Outstanding | shares 65,912
Outstanding Options, Weighted-Average Remaining Contractual Life 3 years 7 months 6 days
Outstanding Options, Weighted-Average Exercise Price $ 23.27
Exercisable Options, Number of Shares Outstanding | shares 65,912
Exercisable Options, Weighted-Average Exercise Price $ 23.47
$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
Outstanding Options, Number of Shares Outstanding | shares 99,582
Outstanding Options, Weighted-Average Remaining Contractual Life 4 years 5 months 15 days
Outstanding Options, Weighted-Average Exercise Price $ 33.94
Exercisable Options, Number of Shares Outstanding | shares 99,582
Exercisable Options, 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
Outstanding Options, Number of Shares Outstanding | shares 308,924
Outstanding Options, Weighted-Average Remaining Contractual Life 7 years 2 months 26 days
Outstanding Options, Weighted-Average Exercise Price $ 71.06
Exercisable Options, Number of Shares Outstanding | shares 158,166
Exercisable Options, Weighted-Average Exercise Price $ 69.19
$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
Outstanding Options, Number of Shares Outstanding | shares 510,514
Outstanding Options, Weighted-Average Remaining Contractual Life 7 years 7 months 6 days
Outstanding Options, Weighted-Average Exercise Price $ 87.76
Exercisable Options, Number of Shares Outstanding | shares 274,285
Exercisable Options, Weighted-Average Exercise Price $ 84.27