Supplemental Stockholders' Equity Information - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 25, 2022	Sep. 30, 2023	Sep. 25, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit (income)/costs	$ (684)	$ 1,757	$ (2,053)	$ 4,903
Total reclassification, before tax	(69,987)	(50,837)	(162,721)	(142,315)
Income tax expense	(16,372)	(14,220)	(40,211)	(39,196)
Total reclassification, net of tax	$ (53,615)	$ (36,617)	(122,510)	$ (103,119)
Amounts reclassified from accumulated other comprehensive loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification, before tax			4,656
Income tax expense			1,230
Total reclassification, net of tax			3,426
Amounts reclassified from accumulated other comprehensive loss | Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit (income)/costs			(1,459)
Amounts reclassified from accumulated other comprehensive loss | Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of net periodic benefit (income)/costs			$ 6,115