Goodwill and other intangible assets, net - Components of intangible assets (Details) - USD ($) $ in Thousands	Jul. 02, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 2,132,784	$ 1,564,359
Accumulated Amortization	(519,880)	(472,696)
In-process research and development
Finite-Lived Intangible Assets [Line Items]
In-process research and development	33,595	16,532
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	892,574	622,428
Accumulated Amortization	(259,002)	(239,055)
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	774,980	519,962
Accumulated Amortization	(226,354)	(203,390)
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	23,452	23,021
Accumulated Amortization	(16,208)	(15,239)
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	405,283	379,724
Accumulated Amortization	(16,862)	(13,974)
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,900	2,692
Accumulated Amortization	$ (1,454)	$ (1,038)