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Fair Value (Details) - USD ($)
$ in Thousands
May. 30, 2015
Aug. 30, 2014
May. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Taxable bond $ 27,023 $ 27,023  
Fair Value on non-financial assets or 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%