CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ 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
Income Statement [Abstract]
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
Cost of sales		6,566,667		6,610,269	6,013,541		5,598,202	4,975,583	19,033,044		16,587,326		23,197,595
Gross profit		923,778			842,567				2,725,542		2,427,788
Operating expenses:
Selling, general, and administrative expenses		575,751			552,656				1,719,108		1,599,963
Depreciation and amortization		45,532			38,574				139,201		113,096
Loss on disposition of businesses, net		2,042			0				3,604		0
Restructuring, integration, and other charges		10,143			15,896				50,497		55,817
Total operating expenses		633,468			607,126				1,912,410		1,768,876
Operating income		290,310		286,824	235,441		230,446	193,025	813,132		658,912		945,736
Equity in earnings (losses) of affiliated companies		(652)			1,216				(808)		2,865
Gain (loss) on investments, net		1,070			(13,029)				(3,945)		(8,784)
Loss on extinguishment of debt		0			786				0		59,545
Employee benefit plan expense		1,296			1,850				3,784		5,547
Interest and other financing expense, net		54,205			40,111				160,187		120,898
Income before income taxes		235,227			180,881				644,408		467,003
Provision for income taxes		57,054			45,972				155,325		115,128
Consolidated net income		178,173			134,909				489,083		351,875
Noncontrolling interests		1,640			845				3,541		3,352
Net income attributable to shareholders		$ 176,533		$ 53,653	$ 134,064		$ 99,722	$ 114,737	$ 485,542		$ 348,523		$ 402,176
Net income per share:
Basic		$ 2.02			$ 1.52				$ 5.53		$ 3.92
Diluted	[2]	$ 1.99			$ 1.50				$ 5.47		$ 3.88
Weighted-average shares outstanding:
Basic		87,602			88,453				87,785		88,870
Diluted		88,608			89,540				88,759		89,936

[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] Stock-based compensation awards for the issuance of 582 and 540 shares for the third quarter and first nine months of 2018 and 396 and 363 shares for the third quarter and first nine months of 2017, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.