Restructuring charges and impairment charges - Charges By Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 53,488	$ 870	$ 56,551	$ 13,815
Vascular North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	202	353	523	1,081
Interventional North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	362	191	907	4,406
Anesthesia North America
Restructuring Cost and Reserve [Line Items]
Restructuring charges	91	564	125	811
EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring charges	52,539	(412)	52,790	7,115
All Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 294	$ 174	$ 2,206	$ 402