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Fair Value (Details) - USD ($)
6 Months Ended
Mar. 02, 2019
Mar. 03, 2018
Sep. 01, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Taxable bonds $ 27,025,000   $ 27,025,000
Gains and losses on securities 0    
Fair value of non-financial assets on non-recurring basis 0 $ 0  
Fair value of non-financial liabilities on non-recurring basis $ 0 $ 0  
Corporate Bond Securities [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate on bonds 2.40%