Supplemental Stockholders' Equity Information - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of revenue (excluding depreciation and amortization)	$ 2,598	$ 2,149	$ 5,197	$ 4,463
Total reclassification, before tax	72,560	29,443	123,130	68,303
Income tax expense	18,243	5,781	27,704	11,787
Total reclassification, net of tax	$ 54,317	$ 23,662	95,426	$ 56,516
Amounts reclassified from accumulated other comprehensive loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification, before tax			12,815
Income tax expense			3,432
Total reclassification, net of tax			9,383
Amounts reclassified from accumulated other comprehensive loss | Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of revenue (excluding depreciation and amortization)			(2,644)
Amounts reclassified from accumulated other comprehensive loss | Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of revenue (excluding depreciation and amortization)			$ 15,459