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Employee and Retiree Benefits (Postretirement Health Care and Deferred Compensation Benefits) (Details) - USD ($)
$ in Thousands
Feb. 25, 2017
Aug. 27, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]    
Postretirement health care benefit cost $ 0 $ 6,346
Non-qualified deferred compensation 17,230 18,003
Executive share option plan liability 2,468 3,341
SERP benefit liability 2,723 2,681
Executive deferred compensation 495 389
Officer stock-based compensation 1,080 763
Total deferred compensation and postretirement health care benefits 23,996 31,523
Less current portion (4,626) (4,574)
Long-term deferred compensation and postretirement health care benefits $ 19,370 $ 26,949