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Share-Based Compensation - Total Options Outstanding, Range of Exercise Prices and Remaining Contractual Lives (Detail)
shares in Thousands
3 Months Ended
Aug. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
No. of Options | shares 475
Weighted Average Exercise Price $ 24.58
Weighted Average Remaining Life 1 year 7 months 6 days
$9.63 to $12.82 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Prices, Lower limit $ 9.63
Range of Prices, Upper limit $ 12.82
No. of Options | shares 30
Weighted Average Exercise Price $ 12.63
Weighted Average Remaining Life 1 year 1 month 6 days
$12.83 to $16.03 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Prices, Lower limit $ 12.83
Range of Prices, Upper limit $ 16.03
No. of Options | shares 136
Weighted Average Exercise Price $ 15.24
Weighted Average Remaining Life 1 year 1 month 6 days
$16.04 to $32.05 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Prices, Lower limit $ 16.04
Range of Prices, Upper limit $ 32.05
No. of Options | shares 309
Weighted Average Exercise Price $ 29.83
Weighted Average Remaining Life 1 year 10 months 24 days