Revenues - Location of Customer (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 637,530	$ 668,639	$ 1,224,705	$ 1,274,204
Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	369,862	396,893	696,389	746,025
Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	267,668	271,746	528,316	528,179
Americas
Disaggregation of Revenue [Line Items]
Revenues	398,931	411,720	762,769	786,807
Americas | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	244,670	256,191	455,934	481,474
Americas | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	154,261	155,529	306,835	305,333
EMEA
Disaggregation of Revenue [Line Items]
Revenues	144,654	156,574	285,289	302,498
EMEA | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	72,932	82,595	140,252	155,927
EMEA | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	71,722	73,979	145,037	146,571
APAC
Disaggregation of Revenue [Line Items]
Revenues	93,945	100,345	176,647	184,899
APAC | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	52,260	58,107	100,203	108,624
APAC | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 41,685	$ 42,238	$ 76,444	$ 76,275