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Stock Options Outstanding (Detail)
12 Months Ended
Mar. 31, 2016
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Options Outstanding, Number of Shares Outstanding | shares 1,817,763
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 6 months 7 days
Options Outstanding, Weighted-Average Exercise Price $ 53.03
Options Exercisable, Number of Shares Outstanding | shares 1,285,412
Options Exercisable, Weighted-Average Exercise Price $ 43.12
$23.17 - $30.74 [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 $ 30.74
Options Outstanding, Number of Shares Outstanding | shares 476,671
Options Outstanding, Weighted-Average Remaining Contractual Life 4 years 15 days
Options Outstanding, Weighted-Average Exercise Price $ 26.59
Options Exercisable, Number of Shares Outstanding | shares 474,671
Options Exercisable, Weighted-Average Exercise Price $ 26.58
$33.08 - $37.95 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range 33.08
Range of Exercise Prices, Upper Range $ 37.95
Options Outstanding, Number of Shares Outstanding | shares 465,933
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 11 months 23 days
Options Outstanding, Weighted-Average Exercise Price $ 33.91
Options Exercisable, Number of Shares Outstanding | shares 445,933
Options Exercisable, Weighted-Average Exercise Price $ 33.87
$53.22 - $74.10 [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 $ 74.10
Options Outstanding, Number of Shares Outstanding | shares 307,936
Options Outstanding, Weighted-Average Remaining Contractual Life 7 years 22 days
Options Outstanding, Weighted-Average Exercise Price $ 66.10
Options Exercisable, Number of Shares Outstanding | shares 194,825
Options Exercisable, Weighted-Average Exercise Price $ 66.64
$79.73 - $ 93.56 [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 $ 93.56
Options Outstanding, Number of Shares Outstanding | shares 567,223
Options Outstanding, Weighted-Average Remaining Contractual Life 8 years 9 months
Options Outstanding, Weighted-Average Exercise Price $ 83.87
Options Exercisable, Number of Shares Outstanding | shares 169,983
Options Exercisable, Weighted-Average Exercise Price $ 86.67