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Goodwill and Intangibles - Additional Information (Detail) - USD ($) | 4 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 25, 2018 | Feb. 10, 2018 | Aug. 26, 2017 | Aug. 25, 2018 | Aug. 26, 2017
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill impairment charge | $ 0 |  | $ 0 |  |
Accumulated goodwill impairment | 107,500,000 |  | 18,300,000 | $ 107,500,000 | $ 18,300,000
Amortization expense of intangible assets |  |  |  | 5,100,000 | 8,500,000
Trade Name [Member] | AutoAnything's and Interamerican Motor Corporation [Member] |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment charge |  | $ 26,900,000 |  |  |
Accumulated impairment | $ 31,000,000 |  | $ 4,100,000 | $ 31,000,000 | $ 4,100,000

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