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Earnings Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2014
Nov. 30, 2013
Earnings Per Share [Abstract]        
Anti-dilutive options not included in the computation of diluted earnings per share 9.1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 7.9us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount