Leases (Schedule Of Rent Expense For Operating And Capital Leases) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Leases [Abstract]
Operating leases, Minimum rentals	$ 14,555	$ 14,185	$ 14,330
Operating leases, Contingent rentals	103	138	176
Operating leases, Sublease rentals	(2,851)	(2,847)	(2,993)
Capital leases, Contingent rentals	799	745	740
Operating leases and Capital leases rent expense	$ 12,606	$ 12,221	$ 12,253