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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 29, 2020 | Aug. 31, 2019
Income Taxes |  |
Beginning balance | $ 30,892 | $ 26,077
Additions based on tax positions related to the current year | 8,512 | 8,621
Additions for tax positions of prior years | 946 | 2,115
Reductions for tax positions of prior years | (4,124) | (1,219)
Reductions due to settlements |  | (1,918)
Reductions due to statute of limitations | (4,284) | (2,784)
Ending balance | $ 31,942 | $ 30,892

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