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Accumulated Other Comprehensive Loss - Before and After Tax Amounts for Comprehensive Income (Loss) Components (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Oct. 03, 2021	Jul. 04, 2021	Apr. 04, 2021	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Oct. 03, 2021	Sep. 27, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss)	$ (35,118)	$ 438,823	$ (26,198)	$ 32,212	$ 39,110	$ (93,987)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss) before tax	(37,077)			24,674			$ (57,261)	$ (27,866)
Other comprehensive income/(loss), tax	0			0			0	(7,581)
Other comprehensive income/(loss)	(37,077)			24,674			(57,261)	(35,447)
Defined benefit pension items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss)/income before reclassifications before tax	559			(31)			14,923	(1,177)
Other comprehensive (loss)/income before reclassifications, tax	(145)			8			(3,621)	292
Other comprehensive (loss)/income before reclassifications, net of tax	414			(23)			11,302	(885)
Amounts reclassified from accumulated other comprehensive income/(loss) before tax							562,625	21,877
Amounts reclassified from accumulated other comprehensive income/(loss), tax							(144,104)	(5,516)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax							418,521	16,361
Other comprehensive income/(loss) before tax	2,220			7,072			577,548	20,700
Other comprehensive income/(loss), tax	(527)			(1,792)			(147,725)	(5,224)
Other comprehensive income/(loss)	1,693			5,280			429,823	15,476
Defined benefit pension items | Net Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	1,661			7,103
Amounts reclassified from accumulated other comprehensive income/(loss), tax	(382)			(1,800)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	1,279			5,303
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss)/income before reclassifications before tax	3,525			1,376			10,536	(4,345)
Other comprehensive (loss)/income before reclassifications, tax	(940)			(336)			(2,732)	983
Other comprehensive (loss)/income before reclassifications, net of tax	2,585			1,040			7,804	(3,362)
Other comprehensive income/(loss) before tax	1,268			3,024			7,231	(498)
Other comprehensive income/(loss), tax	(338)			(739)			(1,861)	58
Other comprehensive income/(loss)	930			2,285			5,370	(440)
Cash Flow Hedges | Fixed Assets
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	20			0			(42)	0
Amounts reclassified from accumulated other comprehensive income/(loss), tax	(5)			0			11	0
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	15			0			(31)	0
Cash Flow Hedges | Net Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	(2,277)			1,648			(3,263)	3,847
Amounts reclassified from accumulated other comprehensive income/(loss), tax	607			(403)			860	(925)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	(1,670)			1,245			(2,403)	2,922
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss) before tax	(33,589)			34,770			527,518	(7,664)
Other comprehensive income/(loss), tax	(865)			(2,531)			(149,586)	(12,747)
Other comprehensive income/(loss)	$ (34,454)	$ 438,064	$ (25,678)	$ 32,239	$ 39,700	$ (92,350)	$ 377,932	$ (20,411)

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