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Employee and Retiree Benefits (Postretirement Benefit Income) (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 25, 2017
Nov. 26, 2016
Retirement Benefits [Abstract]    
Interest cost $ 0 $ 29
Service cost 0 16
Amortization of prior service benfit 0 (20,772)
Amortization of net actuarial loss 0 7,959
Net periodic postretirement benefit income 0 (12,768)
Payments for postretirement health care $ 0 $ 53