Restructuring, acquisition and integration-related costs - Restructuring and Related Costs by Type of Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 26,338		$ 100,087
Estimated remaining restructuring costs	35		35
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring costs	17,711	$ 7,284	78,383	$ 43,197
Acquisition integration-related costs	(1)	180	1,153	2,736
Restructuring, acquisition transaction and integration-related costs	17,710	7,464	79,536	45,933
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	8,627	491	21,704	2,336
Acquisition transaction-related costs	0	413	(210)	1,330
Acquisition integration-related costs	137	1,147	1,702	4,554
Restructuring, acquisition transaction and integration-related costs	$ 8,764	$ 2,051	$ 23,196	$ 8,220