Derivative Financial Instruments And Hedging Activities (Impact Of Derivative For Interest Rate Risk And Designated As Hedging Instrument On AOCI And Earnings) (Details) (Interest Rate Swap [Member], USD $) In Thousands	12 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)		$ (13)
Interest Expense [Member]
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(3,950)	(4,218)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)