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Employee and Retiree Benefits - Postretirement Health Care and Deferred Compensation Benefits (Details) - USD ($)
$ in Thousands
Aug. 29, 2020
Aug. 31, 2019
Retirement Benefits [Abstract]    
Non-qualified deferred compensation $ 11,460 $ 13,093
Supplemental executive retirement plan 1,838 2,072
Executive share option plan 0 12
Executive deferred compensation plan 710 621
Total deferred compensation benefits 14,008 15,798
Less current portion 2,878 2,920
Deferred compensation benefits, net of current portion $ 11,130 $ 12,878