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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
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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

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