Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2021	Dec. 27, 2020	Dec. 29, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 1,328,111	$ 1,173,863	$ 1,042,641
Income tax (benefit)/expense	9,918	31,125	8,179
Net current-period other comprehensive (loss)/income, net of tax	26,979	84,795	22,748
Ending balance	1,540,725	1,328,111	1,173,863
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	8,386
Other comprehensive (loss)/income before reclassifications, before tax	(6,328)
Amounts reclassified from accumulated other comprehensive loss, before tax	0
Income tax (benefit)/expense	(1,696)
Net current-period other comprehensive (loss)/income, net of tax	(4,632)
Ending balance	3,754	8,386
Funded Status of Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(421,698)
Other comprehensive (loss)/income before reclassifications, before tax	23,331
Amounts reclassified from accumulated other comprehensive loss, before tax	25,919
Income tax (benefit)/expense	13,232
Net current-period other comprehensive (loss)/income, net of tax	36,018
Ending balance	(385,680)	(421,698)
Net unrealized gain on Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	3,131
Other comprehensive (loss)/income before reclassifications, before tax	(6,025)
Amounts reclassified from accumulated other comprehensive loss, before tax	0
Income tax (benefit)/expense	(1,618)
Net current-period other comprehensive (loss)/income, net of tax	(4,407)
Ending balance	(1,276)	3,131
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(410,181)	(494,976)	(517,724)
Other comprehensive (loss)/income before reclassifications, before tax	10,978
Amounts reclassified from accumulated other comprehensive loss, before tax	25,919
Income tax (benefit)/expense	9,918
Net current-period other comprehensive (loss)/income, net of tax	26,979	84,795	22,748
Ending balance	$ (383,202)	$ (410,181)	$ (494,976)