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Employee and Retiree Benefits (Investment in Life Insurance) (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 25, 2012
Aug. 27, 2011
Compensation and Retirement Disclosure [Abstract]    
Cash value $ 53,948 $ 53,650
Borrowings (30,821) (29,981)
Investment in life insurance $ 23,127 $ 23,669