Contingencies and Other Accrued Losses - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
	Nov. 30, 2013	May 31, 2010	May 31, 2013
Schedule Of Commitments And Contingencies [Line Items]
Accrued contingencies			$ 65,100,000
(Decrease) in contingent payment	(61,894,000)
Expected payment to resolve issues arising out of investigation and other related costs	2,800,000
Miscellaneous expenses	$ 400,000	$ 42,600,000