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Income Taxes - Changes in Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 29, 2020
Aug. 31, 2019
Aug. 25, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year $ 2,822 $ 1,220 $ 1,195
Gross increases-tax positions in a prior year 2,486 1,173 25
Gross increases-current year tax positions 522 429 0
Balance at end of year 5,830 2,822 1,220
Accrued interest and penalties 681 769 525
Total unrecognized tax benefits $ 6,511 $ 3,591 $ 1,745