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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				6 Months Ended
	Jul. 04, 2021	Apr. 04, 2021	Jun. 28, 2020	Mar. 29, 2020	Jul. 04, 2021	Jun. 28, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ 438,823	$ (26,198)	$ 39,110	$ (93,987)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss) before tax	11,837		33,454		$ (20,184)	$ (52,540)
Other comprehensive income/(loss), tax	0		0		0	(7,581)
Other comprehensive income (loss)	11,837		33,454		(20,184)	(60,121)
Defined benefit pension items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss)/income before reclassifications before tax	14,213		(1,410)		14,364	(1,146)
Other comprehensive (loss)/income before reclassifications, tax	(3,441)		351		(3,476)	284
Other comprehensive (loss)/income before reclassifications, net of tax	10,772		(1,059)		10,888	(862)
Amounts reclassified from accumulated other comprehensive income/(loss) before tax					560,964	14,774
Amounts reclassified from accumulated other comprehensive income/(loss), tax					(143,722)	(3,716)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax					417,242	11,058
Other comprehensive income/(loss) before tax	568,276		5,880		575,328	13,628
Other comprehensive income/(loss), tax	(145,531)		(1,464)		(147,198)	(3,432)
Other comprehensive income (loss)	422,745		4,416		428,130	10,196
Defined benefit pension items | Net Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	554,063		7,290
Amounts reclassified from accumulated other comprehensive income/(loss), tax	(142,090)		(1,815)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	411,973		5,475
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss)/income before reclassifications before tax	5,674		1,612		7,012	(5,721)
Other comprehensive (loss)/income before reclassifications, tax	(1,452)		(394)		(1,793)	1,319
Other comprehensive (loss)/income before reclassifications, net of tax	4,222		1,218		5,219	(4,402)
Other comprehensive income/(loss) before tax	4,680		2,421		5,964	(3,522)
Other comprehensive income/(loss), tax	(1,198)		(591)		(1,524)	797
Other comprehensive income (loss)	3,482		1,830		4,440	(2,725)
Cash Flow Hedges | Fixed Assets
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	(49)		0		(62)	0
Amounts reclassified from accumulated other comprehensive income/(loss), tax	13		0		16	0
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	(36)		0		(46)	0
Cash Flow Hedges | Net Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	(945)		809		(986)	2,199
Amounts reclassified from accumulated other comprehensive income/(loss), tax	241		(197)		253	(522)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	(704)		612		(733)	1,677
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss) before tax	584,793		41,755		561,108	(42,434)
Other comprehensive income/(loss), tax	(146,729)		(2,055)		(148,722)	(10,216)
Other comprehensive income (loss)	$ 438,064	$ (25,678)	$ 39,700	$ (92,350)	$ 412,386	$ (52,650)

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