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Employee and Retiree Benefits (Postretirement Health Care and Deferred Compensation Benefits) (Details) - USD ($)
$ in Thousands
Feb. 24, 2018
Aug. 26, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]    
Non-qualified deferred compensation $ 15,680 $ 16,476
Executive share option plan liability 1,356 1,498
SERP benefit liability 2,565 2,534
Executive deferred compensation 451 447
Officer stock-based compensation 3,292 1,664
Total deferred compensation 23,344 22,619
Less current portion (4,437) (3,349)
Long-term deferred compensation $ 18,907 $ 19,270