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Share-Based Compensation - Summary of Transactions Involving Stock Options (Detail) - $ / shares
shares in Thousands
 3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares under option, beginning of period, No. of Options 490 816
Granted, No. of Options 0 0
Exercised, No. of Options (15) (96)
Cancelled, No. of Options 0 0
Expired, No. of Options 0 0
Shares under option, end of period, No. of Options 475 720
Exercisable at end of period, No. of Options 475 720
Shares under option, beginning of period, Weighted Average Exercise Price $ 24.80 $ 19.61
Granted, Weighted Average Exercise Price 0 0
Exercised, Weighted Average Exercise Price 31.75 9.36
Cancelled, Weighted Average Exercise Price 0 0
Expired, Weighted Average Exercise Price 0 0
Shares under option, end of period, Weighted Average Exercise Price 24.58 20.96
Exercisable at end of period, Weighted Average Exercise Price $ 24.58 $ 20.96