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Income Taxes Changes in Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2019
Aug. 25, 2018
Aug. 26, 2017
Income Tax Disclosure [Abstract]      
Balance at beginning of year $ 1,220 $ 1,195 $ 1,710
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions 1,173 25  
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions     (536)
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 429 0 21
Balance at end of year 2,822 1,220 1,195
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 769 525 411
Unrecognized tax benefits $ 3,591 $ 1,745 $ 1,606