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Other Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income |  |  |  |
Amortization of prior service and net actuarial loss | $ 253,390 | $ 231,025 | $ 684,012 | $ 737,368
Amortization of prior service and net actuarial loss | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income |  |  |  |
Amortization of prior service and net actuarial loss | $ 452 | $ 60 | $ 1,226 | $ 184

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