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Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share, Calculated using Two-Class Method (Parenthetical) (Detail)
3 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Stock-based compensation plans, excluded from the calculation of diluted earnings per share, anti-dilutive shares of stock 3,034,000 3,097,000