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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 25, 2018 | Aug. 26, 2017
Income Tax Disclosure [Abstract] |  |
Beginning balance | $ 22,201 | $ 27,726
Additions based on tax positions related to the current year | 8,184 | 7,089
Additions for tax positions of prior years | 1,404 | 278
Reductions for tax positions of prior years | (482) | (6,954)
Reductions due to settlements | (1,930) | (1,964)
Reductions due to statute of limitations | (3,300) | (3,974)
Ending balance | $ 26,077 | $ 22,201

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