Changes in accumulated other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 01, 2022	Oct. 02, 2021
Accumulated Other Comprehensive Income [Roll Forward]
Beginning of Period			$ (359,084)	$ (488,428)
Other comprehensive income before reclassification			(102,421)	(28,468)
Amounts reclassified from accumulated other comprehensive income			7,646	14,691
Net current-period other comprehensive income			(94,775)	(13,777)
End of Period	$ (453,859)	$ (502,205)	(453,859)	(502,205)
Accumulated Other Comprehensive (income) Loss, Defined Benefit Plan, Tax	(32,600)	(88,400)	(32,600)	(88,400)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax	17,900	(7,500)	17,900	(7,500)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax			6,900	700
Unrealized gain on interest rate swap, tax	8,574	1,065	22,389	5,637
Other Comprehensive Income (Loss), Unrealized Gain (loss) Certain Investments, Tax			(400)
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Beginning of Period			(97,654)	(49,961)
Other comprehensive income before reclassification			(201,176)	(33,000)
Amounts reclassified from accumulated other comprehensive income			0	0
Net current-period other comprehensive income			(201,176)	(33,000)
End of Period	(298,830)	(82,961)	(298,830)	(82,961)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Beginning of Period			(249,696)	(400,919)
Other comprehensive income before reclassification			(44,127)	(3,052)
Amounts reclassified from accumulated other comprehensive income			0	0
Net current-period other comprehensive income			44,127	3,052
End of Period	(205,569)	(397,867)	(205,569)	(397,867)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest Rate Swap
Accumulated Other Comprehensive Income [Roll Forward]
Beginning of Period			(13,064)	(37,548)
Other comprehensive income before reclassification			55,958	1,480
Amounts reclassified from accumulated other comprehensive income			7,646	14,691
Net current-period other comprehensive income			63,604	16,171
End of Period	50,540	(21,377)	50,540	(21,377)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent
Accumulated Other Comprehensive Income [Roll Forward]
Beginning of Period			1,330	0
Other comprehensive income before reclassification			(1,330)	0
Amounts reclassified from accumulated other comprehensive income			0	0
Net current-period other comprehensive income			(1,330)	0
End of Period	$ 0	$ 0	$ 0	$ 0