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Employee and Retiree Benefits (Details) - USD ($)
$ in Thousands
Feb. 27, 2021
Aug. 29, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]    
Non-qualified deferred compensation $ 10,583 $ 11,460
Supplemental executive retirement plan 1,864 1,838
Executive deferred compensation plan 924 710
Deferred compensation benefits 13,371 14,008
Less current portion 2,850 2,878
Deferred compensation benefits, net of current portion $ 10,521 $ 11,130