Business And Summary Of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2018 $ / shares	Sep. 01, 2018 USD ($) store $ / shares shares	Sep. 01, 2018 USD ($) store warehouse	Sep. 02, 2017 USD ($)	Sep. 03, 2016 USD ($) $ / shares shares
Summary Of Significant Accounting Policies [Line Items]
Number of branch offices | store		100	100
Number of customer fulfillment centers | warehouse			12
Cash equivalents		$ 0	$ 0	$ 0
Amortization expense			10,513	8,223	$ 14,478
Impairment loss			0	0	0
Deferred principal catalog costs		3,973	$ 3,973	4,778
Period deferred principal catalog costs remain the most current source of sales			1 year
Advertising costs			$ 15,530	16,289	19,242
Shipping and handling costs			130,340	119,979	118,174
Expenditures for property, plant and equipment			44,919	46,548	87,930
Cost of repurchase, per share | $ / shares	$ 82.64
Purchases of treasury stock			82,369	49,182	$ 383,798
Unrecognized tax benefit that would affect effective tax rate		$ 9,407	$ 9,407	5,689
Class A Common Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Repurchases of common stock, Shares | shares		45
Cost of repurchase, per share | $ / shares		$ 82.64
Class A Common Stock [Member] | Purchases From Class B Holders [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares repurchased and retired | shares					1,152
Cost of repurchase, per share | $ / shares					$ 72.50
Purchases of treasury stock					$ 83,524
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Original manufacturers warranty period			30 days
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Warranty period			1 year
Original manufacturers warranty period			90 days
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage			3.00%
Sid Tool Co., Inc. [Member] | Mitchmar Atlanta Properties, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Expenditures for property, plant and equipment					$ 33,650
Leasehold Improvements And Buildings [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life			3 years
Leasehold Improvements And Buildings [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life			40 years
Furniture, Fixtures And Equipment [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life			3 years
Furniture, Fixtures And Equipment [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment estimated useful life			20 years
Trademark [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets acquired during period				12,980
Impairment of intangible assets			$ 129	$ 17
Customer Relationships And Trademarks [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets acquired during period			$ 23,285