Revenues - Location of Customer (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 668,639	$ 610,633	$ 1,274,204	$ 1,162,014
Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	396,893	348,804	746,025	663,082
Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	271,746	261,829	528,179	498,932
Americas
Disaggregation of Revenue [Line Items]
Revenues	411,720	388,468	786,807	745,791
Americas | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	256,191	232,215	481,474	447,345
Americas | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	155,529	156,253	305,333	298,446
EMEA
Disaggregation of Revenue [Line Items]
Revenues	156,574	127,146	302,498	240,009
EMEA | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	82,595	59,099	155,927	107,677
EMEA | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	73,979	68,047	146,571	132,332
APAC
Disaggregation of Revenue [Line Items]
Revenues	100,345	95,019	184,899	176,214
APAC | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	58,107	57,490	108,624	108,060
APAC | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 42,238	$ 37,529	$ 76,275	$ 68,154