Segment and Geographic Information - Geographic Sales & PP&E (Details) - USD ($) $ in Thousands		3 Months Ended							9 Months Ended				12 Months Ended
		Sep. 29, 2018		Dec. 31, 2017	Sep. 30, 2017		Jul. 01, 2017	Apr. 01, 2017	Sep. 29, 2018		Sep. 30, 2017		Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Sales		$ 7,490,445	[1]	$ 7,539,449	$ 6,856,108	[1]	$ 6,422,226	$ 5,736,780	$ 21,758,586	[1]	$ 19,015,114	[1]	$ 26,554,563
Property, plant, and equipment, net		838,563		838,475					838,563				838,475
Americas [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant, and equipment, net	[2]	690,146		688,637					690,146				688,637
EMEA [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant, and equipment, net		107,205		108,232					107,205				108,232
Asia Pacific [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant, and equipment, net		41,212		41,606					41,212				41,606
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales		3,181,227			2,853,505				8,799,364		7,863,591
Property, plant, and equipment, net		685,742		$ 683,988					685,742				$ 683,988
Global Components [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales		5,381,078			4,864,361				15,595,374		13,385,514
Global Components [Member] | Americas [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales		2,060,920			1,816,772				5,795,500		5,080,558
Global Components [Member] | EMEA [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales	[3]	1,399,435			1,262,048				4,325,793		3,572,720
Global Components [Member] | Asia Pacific [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales		1,920,723			1,785,541				5,474,081		4,732,236
Global ECS [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales		2,109,367			1,991,747				6,163,212		5,629,600
Global ECS [Member] | Americas [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales		1,457,719			1,357,709				4,040,164		3,759,597
Global ECS [Member] | EMEA [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales	[3]	$ 651,648			$ 634,038				$ 2,123,048		$ 1,870,003

[1] Includes sales related to the United States of $3,181,227 and $8,799,364 for the third quarter and first nine months of 2018 and $2,853,505 and $7,863,591 for the third quarter and first nine months of 2017, respectively.

[2] Includes net property, plant, and equipment related to the United States of $685,742 and $683,988 at September 29, 2018 and December 31, 2017, respectively.

[3] Defined as Europe, the Middle East, and Africa.