Income Taxes (Significant Items Comprising Deferred Tax Assets) (Details) (USD $)	12 Months Ended
	Aug. 25, 2012	Aug. 29, 2009	Aug. 27, 2011
Income Tax Disclosure [Abstract]
Warranty reserves	$ 2,759,000		$ 2,588,000
Self-insurance reserve	1,556,000		1,204,000
Accrued vacation	1,595,000		1,625,000
Inventory	186,000		669,000
Deferred compensation	1,215,000		1,022,000
Miscellaneous reserves	1,142,000		1,349,000
Total current	8,453,000		8,457,000
Postretirement health care benefits	16,508,000		15,087,000
Deferred compensation	12,416,000		13,493,000
Tax credits and NOL carryforwards	2,750,000		2,755,000
Unrecognized tax benefits	1,416,000		1,625,000
Depreciation	(2,037,000)		(2,426,000)
Other	1,036,000		908,000
Total noncurrent	32,089,000		31,442,000
Total gross deferred tax assets	40,542,000		39,899,000
Valuation allowance	(1,569,000)		(39,250,000)
Total deferred tax assets	38,973,000		649,000
Historical cumulative loss position period		3 years
Historical cumulative income position period	3 years
Unused tax credits	1,400,000
Net operating loss	1,400,000
Net operating loss, not available due to suspension	$ 200,000