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Share-Based Compensation - Summary of Transactions Involving Stock Units and Director Stock Grants (Detail) - Stock and Stock Units [Member] - $ / shares
shares in Thousands
3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance awards, beginning of period 304 310
Granted, No. of Stock Units 16 2
Vested and settled, No. of Stock Units 0 0
Cancelled, No. of Stock Units (1) (7)
Performance awards, end of period 319 305
Performance awards, beginning of period, Weighted Average Fair Value $ 36.23 $ 31.42
Granted, Weighted Average Fair Value 44.47 40.85
Vested and settled, Weighted Average Fair Value 0 0
Cancelled, Weighted Average Fair Value 38.30 31.23
Performance awards, end of period, Weighted Average Fair Value $ 36.64 $ 31.50