Net revenues Other revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Revenue, Major Customer [Line Items]
Net revenues	$ 567,034	$ 652,507	$ 1,197,676	$ 1,266,091
Vascular access
Revenue, Major Customer [Line Items]
Net revenues	164,958	153,647	315,214	297,544
Anesthesia
Revenue, Major Customer [Line Items]
Net revenues	64,867	85,723	140,569	165,975
Interventional
Revenue, Major Customer [Line Items]
Net revenues	82,594	104,785	182,525	207,969
Surgical
Revenue, Major Customer [Line Items]
Net revenues	67,275	95,570	142,707	182,289
Interventional urology
Revenue, Major Customer [Line Items]
Net revenues	40,094	67,952	114,286	127,683
OEM
Revenue, Major Customer [Line Items]
Net revenues	55,832	56,428	119,219	110,666
Other
Revenue, Major Customer [Line Items]
Net revenues	$ 91,414	$ 88,402	$ 183,156	$ 173,965