Shareholders' equity - Change in accumulated other comprehensive income, net of tax (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2022	Sep. 26, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 3,754,748	$ 3,336,457
Other comprehensive income (loss) before reclassifications	(114,725)	(33,139)
Amounts reclassified from accumulated other comprehensive income	2,492	5,495
Net current-period other comprehensive income (loss)	(112,233)	(27,644)
Ending balance	3,895,161	3,657,872
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,081	(482)
Other comprehensive income (loss) before reclassifications	6,871	(77)
Amounts reclassified from accumulated other comprehensive income	(1,335)	1,163
Net current-period other comprehensive income (loss)	5,536	1,086
Ending balance	6,617	604
Pension and Other Postretirement Benefit Plans
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(138,290)	(150,257)
Other comprehensive income (loss) before reclassifications	1,980	245
Amounts reclassified from accumulated other comprehensive income	3,827	4,332
Net current-period other comprehensive income (loss)	5,807	4,577
Ending balance	(132,483)	(145,680)
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(209,750)	(146,559)
Other comprehensive income (loss) before reclassifications	(123,576)	(33,307)
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive income (loss)	(123,576)	(33,307)
Ending balance	(333,326)	(179,866)
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(346,959)	(297,298)
Ending balance	$ (459,192)	$ (324,942)