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Employee and Retiree Benefits - Postretirement Health Care and Deferred Compensation Benefits (Details) - USD ($)
$ in Thousands
Aug. 28, 2021
Aug. 29, 2020
Retirement Benefits [Abstract]    
Non-qualified deferred compensation $ 9,731 $ 11,460
Supplemental executive retirement plan 1,615 1,838
Executive deferred compensation plan 1,029 710
Total deferred compensation benefits 12,375 14,008
Less current portion 2,825 2,878
Deferred compensation benefits, net of current portion $ 9,550 $ 11,130