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Business And Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 27, 2021 USD ($) | Aug. 28, 2021 USD ($) segment store item warehouse | Aug. 29, 2020 USD ($) | Aug. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of branch offices | store |  | 28 |  |
Regional inventory centers | item |  | 7 |  |
Number of customer fulfillment centers | warehouse |  | 11 |  |
Inventory write-down | $ 30,091 | $ 30,091 |  |
Acquired intangible assets |  | 7,375 |  |
Impairment of intangible assets |  |  | 443 |
Amortization expense |  | 10,934 | 11,463 | 11,746
Advertising costs |  | 17,749 | 13,341 | 18,812
Shipping and handling costs |  | 133,737 | 125,859 | $ 138,242
Unrecognized tax benefit that would affect effective tax rate |  | $ 4,782 | $ 10,995 |
Number of Operating Segments | segment |  | 1 |  |
Number of reportable segments | segment |  | 1 |  |
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 |  |
Net Sales [Member] | Geographic Concentration Risk [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk, percentage |  | 100.00% | 100.00% |
Net Sales [Member] | Geographic Concentration Risk [Member] | U.K., Canada, and Mexico [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk, percentage |  | 6.00% |  |
Leasehold Improvements And Building [Member] | Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment estimated useful life |  | 3 years |  |
Leasehold Improvements And Building [Member] | Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment estimated useful life |  | 40 years |  |
Computer Systems, Equipment And Software [Member] | Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment estimated useful life |  | 3 years |  |
Computer Systems, Equipment And Software [Member] | Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment estimated useful life |  | 10 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] |  |  |  |
Impairment of intangible assets |  | $ 236 |  |

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