Goodwill and other intangible assets, net - Components of intangible assets (Details) - USD ($) $ in Thousands	Jun. 26, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,620,228	$ 1,612,646
Accumulated amortization	(445,130)	(412,671)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	624,851	621,078
Accumulated amortization	(228,493)	(214,924)
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	523,189	522,374
Accumulated amortization	(189,454)	(173,903)
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	23,340	23,279
Accumulated amortization	(15,005)	(14,393)
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	387,388	384,821
Accumulated amortization	(11,466)	(8,929)
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,846	2,186
Accumulated amortization	(712)	(522)
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	0	0
Indefinite-lived intangible assets	$ 58,614	$ 58,908