Segment information (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 587,230	$ 487,881
Operating profit	86,843	60,819
Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	113,044	90,581
Unallocated expenses
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	(26,201)	(29,762)
Vascular North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	83,048	79,011
Vascular North America | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	24,662	18,290
Interventional North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	60,196	39,946
Interventional North America | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	14,120	(8,035)
Anesthesia North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	50,565	48,207
Anesthesia North America | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	17,333	13,304
Surgical North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	40,677	45,944
Surgical North America | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	14,748	16,380
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	159,870	133,574
EMEA | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	31,770	21,310
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	58,244	50,168
Asia | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	13,368	10,884
OEM
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	45,854	43,346
OEM | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	9,016	9,121
All other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	88,776	47,685
All other | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	$ (11,973)	$ 9,327