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Employee and Retiree Benefits (Postretirement Benefit Income) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 27, 2016
Feb. 28, 2015
Feb. 27, 2016
Feb. 28, 2015
Compensation and Retirement Disclosure [Abstract]        
Interest cost $ 58 $ 332 $ 211 $ 685
Service cost 23 103 63 213
Amortization of prior service benfit (2,008) (1,327) (3,720) (2,620)
Amortization of net actuarial loss 415 351 782 667
Net periodic postretirement benefit income (1,512) (541) (2,664) (1,055)
Payments for postretirement health care $ 278 $ 225 $ 506 $ 476