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Employee and Retiree Benefits (Investment in Life Insurance) (Details) - USD ($)
$ in Thousands
Aug. 29, 2015
Aug. 30, 2014
Compensation and Retirement Disclosure [Abstract]    
Cash value $ 58,501 $ 55,982
Borrowings (32,329) (30,856)
Investment in life insurance $ 26,172 $ 25,126