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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	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Accumulated comprehensive loss, beginning balance	$ (7,153)	$ (11,172)
Changes in fair value of derivative instruments	(182)	2,637	4,260
Reclassification of net losses realized and included in net income related to derivative instruments	2,285	1,382	654
Accumulated comprehensive loss, ending balance	$ (5,050)	$ (7,153)	$ (11,172)

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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