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Summary of Significant Accounting Policies (Concentration of Risk) (Details) - Sales Revenue, Goods, Net [Member] - Customer Concentration Risk [Member]
12 Months Ended
Aug. 25, 2018
Aug. 26, 2017
Aug. 27, 2016
Dealer 1 [Member]      
Concentration Risk [Line Items]      
Percent of revenue 9.00% 9.90% 16.60%
Dealer 2 [Member]      
Concentration Risk [Line Items]      
Percent of revenue 9.80% 10.00% 13.00%