Property, Plant And Equipment (Summary Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 03, 2016	Aug. 29, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 698,027	$ 631,499
Less: accumulated depreciation and amortization	377,483	340,343
Total	320,544	291,156
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,205	20,783
Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	178,828	150,870
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,551	4,384
Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	172,347	165,589
Computer Systems, Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 317,096	$ 289,873
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