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Earnings Per Share - Additional Information (Detail)	12 Months Ended
Earnings Per Share - Additional Information (Detail)	May 31, 2014	May 31, 2013	May 31, 2012
Earnings Per Share Note [Line Items]
Stock-based compensation plans, excluded from the calculation of diluted earnings per share, anti-dilutive shares of stock	3,057,000	3,095,000	2,625,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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