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Employee and Retiree Benefits (Unrecognized Amounts Included in AOCI) (Details) - USD ($)
$ in Thousands
Aug. 29, 2015
Aug. 30, 2014
Compensation and Retirement Disclosure [Abstract]    
Prior service credit $ (13,279) $ (14,857)
Net actuarial loss 16,410 17,190
Accumulated other comprehensive (loss) income $ 3,131 $ 2,333