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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
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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

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