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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
	Apr. 04, 2021	Mar. 29, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss	$ (26,198)	$ (93,987)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss) before tax	(32,021)	(85,994)
Other comprehensive income/(loss), tax	0	(7,581)
Other comprehensive loss	(32,021)	(93,575)
Defined benefit pension items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss)/income before reclassifications before tax	151	264
Other comprehensive (loss)/income before reclassifications, tax	(36)	(67)
Other comprehensive (loss)/income before reclassifications, net of tax	115	197
Other comprehensive income/(loss) before tax	7,052	7,748
Other comprehensive income/(loss), tax	(1,667)	(1,968)
Other comprehensive loss	5,385	5,780
Defined benefit pension items | Net Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	6,901	7,484
Amounts reclassified from accumulated other comprehensive income/(loss), tax	(1,631)	(1,901)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	5,270	5,583
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss)/income before reclassifications before tax	1,338	(7,333)
Other comprehensive (loss)/income before reclassifications, tax	(340)	1,713
Other comprehensive (loss)/income before reclassifications, net of tax	998	(5,620)
Other comprehensive income/(loss) before tax	1,284	(5,943)
Other comprehensive income/(loss), tax	(326)	1,388
Other comprehensive loss	958	(4,555)
Cash Flow Hedges | Fixed Assets
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	(13)	0
Amounts reclassified from accumulated other comprehensive income/(loss), tax	3	0
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	(10)	0
Cash Flow Hedges | Net Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income/(loss) before tax	(41)	1,390
Amounts reclassified from accumulated other comprehensive income/(loss), tax	11	(325)
Amounts reclassified from accumulated other comprehensive income/(loss) net of tax	(30)	1,065
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss) before tax	(23,685)	(84,189)
Other comprehensive income/(loss), tax	(1,993)	(8,161)
Other comprehensive loss	$ (25,678)	$ (92,350)

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