Property, Plant And Equipment (Summary Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 01, 2018	Sep. 02, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 767,082	$ 727,732
Less: accumulated depreciation and amortization	455,397	411,427
Total	311,685	316,305
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	28,154	28,169
Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	186,208	182,032
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,114	2,595
Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	185,556	178,251
Computer Systems, Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 364,050	$ 336,685
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	7 years
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