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Earnings Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Earnings Per Share [Abstract]        
Anti-dilutive options not included in the computation of diluted earnings per share 0.1 14.5 0 12.6