Contingencies and Other Accrued Losses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013
Schedule Of Commitments And Contingencies [Line Items]
Accrued contingencies		$ 65.1
Payment for contingent liabilities	61.9
Expected payment to resolve issues arising out of investigation and other related costs	1.3
Miscellaneous expenses	$ 1.7