Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Aug. 25, 2012	May 26, 2012	Feb. 25, 2012	Nov. 26, 2011	Aug. 27, 2011	May 28, 2011	Feb. 26, 2011	Nov. 27, 2010	Aug. 25, 2012	Aug. 27, 2011	Aug. 28, 2010
Current [Abstract]
Federal									$ 43,470	$ 22,372	$ 34,373
Foreign									3,604	3,664	4,336
State									8,066	5,089	6,871
Total current									55,140	31,125	45,580
Deferred [Abstract]
Federal									540	11,424	154
Foreign									90	(94)	366
State									(25)	1,631	344
Total deferred									605	12,961	864
Total	12,971	14,901	11,890	15,983	10,039	10,023	10,067	13,957	55,745	44,086	46,444
Reconciliation of Provision for Income Taxes [Abstract]
Income taxes at the statutory federal income tax rate									35.00%	35.00%	35.00%
State income taxes									3.50%	3.70%	3.80%
Adjustments to tax reserves									(0.60%)	(1.10%)	(0.70%)
Foreign tax rate differential									(1.00%)	(1.00%)	(0.60%)
Permanent and other									0.10%	0.00%	0.30%
Total									37.00%	36.60%	37.80%
Deferred Tax Assets [Abstract]
Payroll and benefit related	15,577				14,171				15,577	14,171
Insurance related	12,928				11,831				12,928	11,831
Environmental	7,886				7,235				7,886	7,235
Other	12,588				10,207				12,588	10,207
Total deferred tax assets	48,979				43,444				48,979	43,444
Deferred Tax Liabilities [Abstract]
Tax in excess of book depreciation	42,282				39,317				42,282	39,317
Purchased intangible assets	26,666				24,619				26,666	24,619
Rental merchandise in service	20,992				21,325				20,992	21,325
Other	0				145				0	145
Total deferred tax liabilities	89,940				85,406				89,940	85,406
Net deferred tax liability	40,961				41,962				40,961	41,962
Unrecognized tax benefits that would impact effective tax rate	800				1,700				800	1,700
Accrued income tax interest and penalties	100				600				100	600
Recognized benefit related to income tax interest and penalties									500	900
Recognized expense related to income tax interest and penalties											300
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Beginning balance				2,320				3,556	2,320	3,556
Additions based on tax positions related to the current year									137	253
Statute expirations									(1,406)	(1,256)
Other adjustments										(233)
Ending balance	$ 1,051				$ 2,320				$ 1,051	$ 2,320	$ 3,556