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Segment information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 29, 2019 USD ($) segment	Sep. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			4
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 648,319	$ 609,672	$ 1,914,410	$ 1,806,768
Operating profit	117,621	82,105	300,322	202,438
Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	140,693	126,358	393,095	347,550
Unallocated expenses
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	(23,072)	(44,253)	(92,773)	(145,112)
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	374,493	338,749	1,092,321	993,455
Americas | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	81,405	68,559	229,513	174,764
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	140,518	139,541	442,110	452,826
EMEA | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	21,820	21,916	69,670	80,221
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	77,864	76,544	213,869	207,201
Asia | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	21,460	20,834	50,699	54,948
OEM
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	55,444	54,838	166,110	153,286
OEM | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating profit	$ 16,008	$ 15,049	$ 43,213	$ 37,617

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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