Property, Plant And Equipment (Summary Of Property, Plant And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 01, 2012	Aug. 27, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 396,818	$ 350,015
Less: accumulated depreciation and amortization	222,221	201,202
Total	174,597	148,813
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,039	11,555
Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	81,266	80,019
Property, plant and equipment estimated useful life	40 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,993	5,420
Property, plant and equipment estimated useful life	31 years 6 months
Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	120,724	134,318
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	447	548
Property, plant and equipment estimated useful life	5 years
Computer Systems, Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 174,349	$ 118,155
Minimum [Member] | Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	3 years
Minimum [Member] | Computer Systems, Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	3 years
Maximum [Member] | Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	15 years
Maximum [Member] | Computer Systems, Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	5 years