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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
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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 |  |

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