Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020		Sep. 29, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 1,807,704	$ 1,853,620	$ 1,815,705	[1]	$ 1,772,278
Other comprehensive (loss)/income	32,212	(51,371)	(22,665)		(34,252)
Ending Balance	1,881,333	1,854,313	1,881,333		1,854,313
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			(241,994)		(251,102)
Other comprehensive (loss)/income before reclassifications			(35,447)		(26,863)
Amounts reclassified from accumulated other comprehensive loss net of tax			0
Other comprehensive (loss)/income			(35,447)		(26,863)
Ending Balance	(277,441)	(277,965)	(277,441)		(277,965)
Foreign Currency Items | Fixed Assets
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss net of tax					0
Foreign Currency Items | Net Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss net of tax					0
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			(574,413)		(487,380)
Other comprehensive (loss)/income before reclassifications			(885)		(27,781)
Amounts reclassified from accumulated other comprehensive loss net of tax			16,361
Other comprehensive (loss)/income			15,476		(7,887)
Ending Balance	(558,937)	(495,267)	(558,937)		(495,267)
Defined Benefit Pension Items | Fixed Assets
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss net of tax					0
Defined Benefit Pension Items | Net Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss net of tax					19,894
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			(396)		(2,431)
Other comprehensive (loss)/income before reclassifications			(3,362)		1,434
Amounts reclassified from accumulated other comprehensive loss net of tax			2,922
Other comprehensive (loss)/income			(440)		1,290
Ending Balance	(836)	(1,141)	(836)		(1,141)
Cash Flow Hedges | Fixed Assets
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss net of tax					(110)
Cash Flow Hedges | Net Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss net of tax					(34)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(869,453)	(723,846)	(816,803)		(740,913)
Other comprehensive (loss)/income before reclassifications			(39,694)		(53,210)
Amounts reclassified from accumulated other comprehensive loss net of tax			19,283
Other comprehensive (loss)/income			(20,411)		(33,460)
Ending Balance	$ (837,214)	$ (774,373)	$ (837,214)		(774,373)
Accumulated Other Comprehensive Loss | Fixed Assets
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss net of tax					(110)
Accumulated Other Comprehensive Loss | Net Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss net of tax					$ 19,860

[1] The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America.