Derivative Financial Instruments And Hedging Activities (Schedule Of Gain Loss On Interest Rate Designated As Fair Value Hedges) (Details) (USD $) In Thousands	12 Months Ended
	Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2009
Interest Rate Swap [Member]
Gains (Losses) On The Interest Rate Swaps And The Underlying 7.750% Senior Notes	$ 11,570
7.750% Senior Notes Due 2016 [Member]
Gains (Losses) On The Interest Rate Swaps And The Underlying 7.750% Senior Notes	$ (11,570)