Contingencies and Other Accrued Losses - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended	9 Months Ended
	Feb. 28, 2013		Nov. 30, 2012	Feb. 28, 2013
Schedule Of Commitments And Contingencies [Line Items]
Estimated Loss Contingency	$ 40,502,000	[1]	$ 28,300,000	$ 68,846,000
Accrued contingencies	$ 68,800,000			$ 68,800,000

[1] Restated