Contingencies and Other Accrued Losses - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 30, 2012		Nov. 30, 2012		May 31, 2012	Aug. 31, 2012
Schedule Of Commitments And Contingencies [Line Items]
Increase in long-term accrued product liability reserves			$ 27,000,000		$ 25,800,000
Accrued contingencies	16,900,000		16,900,000			11,400,000
Estimated loss contingency	$ 16,926,000	[1]	$ 28,344,000	[1]

[1] Restated