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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 29, 2021 | Aug. 23, 2020 | Aug. 29, 2021 | Aug. 23, 2020
Net periodic benefit (income) cost: |  |  |  |
Net periodic benefit (income) cost | $ (121) | $ 2,339 | $ (695) | $ 6,714
Pension benefits |  |  |  |
Net periodic benefit (income) cost: |  |  |  |
Net periodic benefit (income) cost | (453) | 1,830 | (1,690) | 5,186
Postretirement benefits |  |  |  |
Net periodic benefit (income) cost: |  |  |  |
Net periodic benefit (income) cost | $ 332 | $ 509 | $ 995 | $ 1,528

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