Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
	Aug. 27, 2011	May 28, 2011	Feb. 26, 2011	Nov. 27, 2010	Aug. 28, 2010	May 29, 2010	Feb. 27, 2010	Nov. 28, 2009	Aug. 27, 2011	Aug. 28, 2010	Aug. 29, 2009
Current [Abstract]
Federal									$ 22,372,000	$ 34,373,000	$ 37,843,000
Foreign									3,664,000	4,336,000	3,835,000
State									5,089,000	6,871,000	7,886,000
Total current									31,125,000	45,580,000	49,564,000
Deferred [Abstract]
Federal									11,424,000	154,000	1,769,000
Foreign									(94,000)	366,000	(563,000)
State									1,631,000	344,000	(157,000)
Total deferred									12,961,000	864,000	1,049,000
Total	10,039,000	10,023,000	10,067,000	13,957,000	10,211,000	10,409,000	10,432,000	15,392,000	44,086,000	46,444,000	50,613,000
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									3.70%	3.80%	4.00%
Adjustments to tax reserves									(1.10%)	(0.70%)	1.00%
Foreign tax rate differential									(1.00%)	(0.60%)	(0.30%)
Permanent and other									0.00%	0.30%	0.30%
Total									36.60%	37.80%	40.00%
Deferred Tax Assets [Abstract]
Payroll and benefit related	14,171,000				13,145,000				14,171,000	13,145,000
Insurance related	11,831,000				9,521,000				11,831,000	9,521,000
Environmental	7,235,000				7,349,000				7,235,000	7,349,000
Other	10,207,000				8,635,000				10,207,000	8,635,000
Total deferred tax assets	43,444,000				38,650,000				43,444,000	38,650,000
Deferred Tax Liabilities [Abstract]
Tax in excess of book depreciation	39,317,000				32,535,000				39,317,000	32,535,000
Purchased intangible assets	24,619,000				22,167,000				24,619,000	22,167,000
Rental merchandise in service	21,325,000				11,511,000				21,325,000	11,511,000
Other	145,000				205,000				145,000	205,000
Total deferred tax liabilities	85,406,000				66,418,000				85,406,000	66,418,000
Net deferred tax liability	41,962,000				27,768,000				41,962,000	27,768,000
Unrecognized tax benefits that would impact effective tax rate	1,700,000				3,000,000				1,700,000	3,000,000
Accrued income tax interest and penalties	600,000				1,500,000				600,000	1,500,000
Recognized benefit related to income tax interest and penalties									900,000
Recognized expense related to income tax interest and penalties										300,000	600,000
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Beginning balance				3,556,000				4,978,000	3,556,000	4,978,000
Additions based on tax positions related to the current year									253,000	184,000
Additions for tax positions of prior years										199,000
Statute expirations									(1,256,000)	(1,805,000)
Other adjustments									(233,000)
Ending balance	$ 2,320,000				$ 3,556,000				$ 2,320,000	$ 3,556,000	$ 4,978,000