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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Aug. 31, 2018
Aug. 31, 2017
Accrued Liabilities, Current [Abstract]    
Wages and employee benefit costs $ 16,338 $ 17,705
Property taxes, sales and use taxes and employment taxes 4,677 5,634
Unredeemed gift cards 13,184 11,319
Other 10,115 10,188
Accrued liabilities $ 44,314 $ 44,846