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Employee Benefit Plans - Net periodic pension cost (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 30, 2021 | Dec. 31, 2020 | Dec. 26, 2019
Net periodic pension cost: |  |  |
Service cost | $ 1,122 | $ 1,095 | $ 833
Interest cost | 1,201 | 1,371 | 1,485
Net amortization of prior service cost and actuarial loss | 1,311 | 990 | 436
Total | $ 3,634 | $ 3,456 | $ 2,754

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