Property, Plant And Equipment (Summary Of Property, Plant And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Sep. 01, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 507,321	$ 396,818
Less: accumulated depreciation and amortization	255,785	222,221
Total	251,536	174,597
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	20,471	16,039
Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	123,675	81,266
Property, plant and equipment estimated useful life	40 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,971	3,993
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	131,981	120,724
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	435	447
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	$ 225,788	$ 174,349
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	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