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Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 02, 2018
Jun. 02, 2018
Jun. 03, 2017
Sep. 02, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Taxable bonds $ 27,025 $ 27,025   $ 27,025
Gains and losses on securities $ 0 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% 2.40%