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Earnings Per Share - Additional Information (Detail)	3 Months Ended		6 Months Ended
Earnings Per Share - Additional Information (Detail)	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded from computation of diluted earnings per share	147,859	396	113,744	197

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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