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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 23, 2020 | Aug. 25, 2019 | Aug. 23, 2020 | Aug. 25, 2019
Net periodic benefit cost: |  |  |  |
Net periodic benefit cost | $ 2,339 | $ 4,868 | $ 6,714 | $ 14,647
Total pension plan contributions | 3,200 |  | 17,700 |
Pension benefits |  |  |  |
Net periodic benefit cost: |  |  |  |
Net periodic benefit cost | 1,830 | 3,975 | 5,186 | 11,968
Postretirement benefits |  |  |  |
Net periodic benefit cost: |  |  |  |
Net periodic benefit cost | $ 509 | $ 893 | $ 1,528 | $ 2,679

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