Shareholders' equity - Change in accumulated other comprehensive income, net of tax (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2023	Jun. 26, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 4,021,968	$ 3,754,748
Other comprehensive income (loss) before reclassifications	23,717	(64,604)
Amounts reclassified from accumulated other comprehensive income	(2,059)	2,868
Net current-period other comprehensive income	21,658	(61,736)
Ending balance	4,215,092	3,852,730
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	4,931	1,081
Other comprehensive income (loss) before reclassifications	8,056	2,839
Amounts reclassified from accumulated other comprehensive income	(4,855)	195
Net current-period other comprehensive income	3,201	3,034
Ending balance	8,132	4,115
Pension and Other Postretirement Benefit Plans
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(135,799)	(138,290)
Other comprehensive income (loss) before reclassifications	(388)	939
Amounts reclassified from accumulated other comprehensive income	2,796	2,673
Net current-period other comprehensive income	2,408	3,612
Ending balance	(133,391)	(134,678)
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(272,654)	(209,750)
Other comprehensive income (loss) before reclassifications	16,049	(68,382)
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive income	16,049	(68,382)
Ending balance	(256,605)	(278,132)
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(403,522)	(346,959)
Ending balance	$ (381,864)	$ (408,695)