Property, Plant And Equipment (Summary Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 02, 2017	Sep. 03, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 727,732	$ 698,027
Less: accumulated depreciation and amortization	411,427	377,483
Total	316,305	320,544
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	28,169	27,205
Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	182,032	178,828
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,595	2,551
Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	178,251	172,347
Computer Systems, Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 336,685	$ 317,096
Minimum [Member] | Building 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] | Building 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