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Changes Related to Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Accumulated other comprehensive loss, beginning balance			$ (5,050)	$ (7,153)
Change in fair value of derivative instruments	(1,445)	3,355	(2,939)	3,864
Reclassification of net losses (gains) realized and included in net income related to derivative instruments, net of tax	2,716	(605)	6,286	(224)
Accumulated other comprehensive loss, ending balance	$ (1,703)	$ (3,513)	$ (1,703)	$ (3,513)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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