Other (Income) Expense, Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended	9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Nov. 30, 2012	Nov. 30, 2012	Feb. 28, 2014	Feb. 28, 2013
Component Of Other Expense Income Nonoperating [Line Items]
Royalty (income), net	$ (433)	$ (848)			$ (824)	$ (1,574)
Loss on Brazil operational repositioning		6,087				6,087
Loss on Kemrock conversion option			800	9,000		9,030
(Income) loss related to unconsolidated equity affiliates	(920)	(525)			(2,454)	40,287
Other (income) expense, net	$ (1,353)	$ 4,714			$ (3,278)	$ 53,830