Segment and Geographic Information - Geographic Sales & PP&E (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Sales		$ 7,918,182	$ 7,490,445	$ 7,392,528	$ 6,875,613	$ 7,539,449	$ 6,856,108	$ 6,422,226	$ 5,736,780	$ 29,676,768	[1]	$ 26,554,563	[1]	$ 23,487,872	[1]
Property, Plant and Equipment, Net		824,700				838,475				824,700		838,475
Americas [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property, Plant and Equipment, Net	[2]	673,228				688,637				673,228		688,637
EMEA [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property, Plant and Equipment, Net		110,996				108,232				110,996		108,232
Asia/Pacific [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property, Plant and Equipment, Net		40,476				41,606				40,476		41,606
UNITED STATES
Revenues From External Customers And Long Lived Assets [Line Items]
Sales										12,157,306		11,038,930		10,137,041
Property, Plant and Equipment, Net		$ 670,201				$ 683,988				670,201		683,988
Global components [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales										20,856,851		18,330,456		15,408,839
Global components [Member] | Americas [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales										7,816,533		7,010,385		5,921,803
Global components [Member] | EMEA [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales	[3]									5,733,222		4,868,862		4,086,607
Global components [Member] | Asia/Pacific [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales										7,307,096		6,451,209		5,400,429
Global ECS [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales										8,819,917		8,224,107		8,079,033
Global ECS [Member] | Americas [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales										5,742,526		5,388,888		5,352,106
Global ECS [Member] | EMEA [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Sales	[3]									$ 3,077,391		$ 2,835,219		$ 2,726,927

[1] Includes sales related to the United States of $12,157,306, $11,038,930, and $10,137,041 for 2018, 2017, and 2016, respectively.

[2] Includes net property, plant, and equipment related to the United States of $670,201 and $683,988 at December 31, 2018 and 2017, respectively.

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