Property, Plant And Equipment (Summary Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 29, 2015	Aug. 30, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 631,499	$ 589,712
Less: accumulated depreciation and amortization	340,343	295,364
Total	291,156	294,348
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	20,783	20,851
Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	150,870	144,955
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,384	4,600
Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 165,589	157,253
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		435
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	$ 289,873	$ 261,618
Minimum [Member] | Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	3 years
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] | Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	40 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	31 years 6 months
Maximum [Member] | Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	20 years
Maximum [Member] | Computer Systems, Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment estimated useful life	5 years