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Summary of Significant Accounting Policies and Practices - Amounts Used In Basic and Diluted Earnings Per Share (Detail) - shares
shares in Thousands
3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Weighted-average number of basic shares outstanding 20,366 20,503
Stock options, stock units and performance awards 335 552
Conversion of non-controlling interest 728 225
Total shares and dilutive securities 21,429 21,280