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Employee and Retiree Benefits (Postretirement Health Care and Deferred Compensation Benefits) (Details) - USD ($)
$ in Thousands
Aug. 31, 2019
Aug. 25, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]    
Non-qualified deferred compensation $ 13,093 $ 14,831
SERP benefit liability 2,072 2,309
Executive share option plan liability 12 935
Executive deferred compensation 621 421
Officer stock-based compensation   1,528
Total postretirement health care and deferred compensation benefits 15,798 20,024
Less current portion (2,920) (4,742)
Long-term deferred compensation benefits $ 12,878 $ 15,282