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Stock-Based Compensation Plans (Expense Components) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2019
Aug. 25, 2018
Aug. 26, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 7,058 $ 7,434 $ 2,977
Time-based share awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation 4,986 4,152 2,606
Performance-based share award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation 716 2,525 69
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation 925 502 164
Other equity awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 431 $ 255 $ 138