Property, Equipment And Capital Leases (Schedule Of Property, Equipment And Capital Leases) (Details) (USD $) In Thousands, unless otherwise specified																	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012 Leasehold Improvements [Member]	Aug. 31, 2011 Leasehold Improvements [Member]	Aug. 31, 2012 Computer And Other Equipment [Member]	Aug. 31, 2011 Computer And Other Equipment [Member]	Aug. 31, 2012 Land [Member]	Aug. 31, 2011 Land [Member]	Aug. 31, 2012 Buildings [Member]	Aug. 31, 2011 Buildings [Member]	Aug. 31, 2012 Equipment [Member]	Aug. 31, 2011 Equipment [Member]	Aug. 31, 2012 Leased Home Office Building [Member]	Aug. 31, 2011 Leased Home Office Building [Member]	Aug. 31, 2012 Leased Drive-In Buildings, Equipment And Other Assets Under Capital Leases, Including Those Held For Sublease [Member]	Aug. 31, 2011 Leased Drive-In Buildings, Equipment And Other Assets Under Capital Leases, Including Those Held For Sublease [Member]	Aug. 31, 2012 Maximum [Member] Computer And Other Equipment [Member]	Aug. 31, 2012 Maximum [Member] Buildings [Member]	Aug. 31, 2012 Maximum [Member] Equipment [Member]	Aug. 31, 2012 Minimum [Member] Computer And Other Equipment [Member]	Aug. 31, 2012 Minimum [Member] Buildings [Member]	Aug. 31, 2012 Minimum [Member] Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 714,997	$ 712,113	$ 4,541	$ 4,541	$ 61,492	$ 52,736	$ 171,102	$ 171,813	$ 358,887	$ 356,536	$ 118,975	$ 126,487
Accumulated depreciation	(295,735)	(273,209)
Property and equipment, net	419,262	438,904
Capital leases, gross													9,990	9,990	39,906	38,675
Accumulated amortization	(26,150)	(22,694)
Capital leases, net	23,746	25,971
Property, equipment and capital leases, net	$ 443,008	$ 464,875
Estimated useful life, (years)																	5 years	25 years	7 years	2 years	8 years	5 years