Guarantor Financial Information (Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 28, 2019	Mar. 30, 2019	Dec. 29, 2018
ASSETS
Cash and cash equivalents	$ 76,339	$ 72,935
Restricted cash	106	110
Accounts receivable	397,700	406,338
Inventories	381,432	362,957
Income taxes refundable	3,106	3,317
Prepaid expenses	45,107	46,599
Other current assets	26,270	25,032
Total current assets	930,060	917,288
Investment in subsidiaries	0	0
Property, plant and equipment, net	1,764,120	1,802,411
Intangible assets, net	497,779	526,394
Goodwill	1,202,592	1,223,291
Investment in unconsolidated subsidiaries	802,184	689,354
Operating right-of-use assets, net	123,859	124,726
Other assets	42,653	47,400
Deferred income taxes	14,532	14,394
Total assets	5,377,779	5,345,258
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current portion of long-term debt	86,397	90,996
Accounts payable	211,596	239,252
Income taxes payable	8,593	8,895
Operating lease liability, current	37,472	37,805
Accrued expenses	307,688	311,391
Total current liabilities	651,746	688,339
Long-term debt, net of current portion	1,664,858	1,558,429
Operating lease liability, non-current	91,250	91,424
Other non-current liabilities	111,145	115,785
Deferred income taxes	250,338	247,931
Total liabilities	2,769,337	2,701,908
Total stockholders’ equity	2,608,442	2,643,350	$ 2,356,699	$ 2,335,821
Total liabilities and stockholders' equity	5,377,779	5,345,258
Parent [Member]
ASSETS
Cash and cash equivalents	903	551
Restricted cash	103	103
Accounts receivable	47,852	51,097
Inventories	24,028	26,893
Income taxes refundable	1,378	1,106
Prepaid expenses	17,927	20,888
Other current assets	4,950	5,399
Total current assets	97,141	106,037
Investment in subsidiaries	5,509,606	5,365,956
Property, plant and equipment, net	432,561	434,237
Intangible assets, net	42,993	44,404
Goodwill	49,902	49,902
Investment in unconsolidated subsidiaries	0	0
Operating right-of-use assets, net	72,161	74,005
Other assets	34,715	35,456
Deferred income taxes	0	0
Total assets	6,239,079	6,109,997
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current portion of long-term debt	50,004	40,916
Accounts payable	887,354	893,490
Income taxes payable	919	(10)
Operating lease liability, current	19,774	20,454
Accrued expenses	97,602	116,758
Total current liabilities	1,055,653	1,071,608
Long-term debt, net of current portion	1,139,898	1,040,974
Operating lease liability, non-current	57,796	58,970
Other non-current liabilities	76,714	80,409
Deferred income taxes	131,000	122,109
Total liabilities	2,461,061	2,374,070
Total stockholders’ equity	3,778,018	3,735,927
Total liabilities and stockholders' equity	6,239,079	6,109,997
Guarantors [Member]
ASSETS
Cash and cash equivalents	25	26
Restricted cash	0	0
Accounts receivable	663,967	702,945
Inventories	97,781	86,609
Income taxes refundable	0	0
Prepaid expenses	2,281	2,241
Other current assets	(3,346)	(2,326)
Total current assets	760,708	789,495
Investment in subsidiaries	1,283,699	1,366,635
Property, plant and equipment, net	521,784	524,577
Intangible assets, net	163,064	170,581
Goodwill	490,748	490,748
Investment in unconsolidated subsidiaries	0	0
Operating right-of-use assets, net	30,475	31,243
Other assets	134	134
Deferred income taxes	0	0
Total assets	3,250,612	3,373,413
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current portion of long-term debt	11	10
Accounts payable	23,026	29,535
Income taxes payable	0	0
Operating lease liability, current	10,592	10,510
Accrued expenses	26,190	32,861
Total current liabilities	59,819	72,916
Long-term debt, net of current portion	27	30
Operating lease liability, non-current	19,462	20,281
Other non-current liabilities	0	0
Deferred income taxes	0	0
Total liabilities	79,308	93,227
Total stockholders’ equity	3,171,304	3,280,186
Total liabilities and stockholders' equity	3,250,612	3,373,413
Non-guarantors [Member]
ASSETS
Cash and cash equivalents	75,411	72,358
Restricted cash	3	7
Accounts receivable	545,669	518,614
Inventories	259,623	249,455
Income taxes refundable	1,728	2,211
Prepaid expenses	24,899	23,470
Other current assets	44,906	40,872
Total current assets	952,239	906,987
Investment in subsidiaries	844,042	844,043
Property, plant and equipment, net	809,775	843,597
Intangible assets, net	291,722	311,409
Goodwill	661,942	682,641
Investment in unconsolidated subsidiaries	802,184	689,354
Operating right-of-use assets, net	21,223	19,478
Other assets	57,336	61,974
Deferred income taxes	14,532	14,394
Total assets	4,454,995	4,373,877
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current portion of long-term debt	56,622	68,983
Accounts payable	160,990	182,484
Income taxes payable	7,674	8,905
Operating lease liability, current	7,106	6,841
Accrued expenses	183,910	161,833
Total current liabilities	416,302	429,046
Long-term debt, net of current portion	574,465	567,589
Operating lease liability, non-current	13,992	12,173
Other non-current liabilities	34,431	35,376
Deferred income taxes	119,338	125,822
Total liabilities	1,158,528	1,170,006
Total stockholders’ equity	3,296,467	3,203,871
Total liabilities and stockholders' equity	4,454,995	4,373,877
Eliminations [Member]
ASSETS
Operating right-of-use assets, net	0	0
LIABILITIES AND STOCKHOLDERS’ EQUITY
Operating lease liability, current	0	0
Operating lease liability, non-current	0	0
Eliminations [Member]
ASSETS
Cash and cash equivalents	0	0
Restricted cash	0	0
Accounts receivable	(859,788)	(866,318)
Inventories	0	0
Income taxes refundable	0	0
Prepaid expenses	0	0
Other current assets	(20,240)	(18,913)
Total current assets	(880,028)	(885,231)
Investment in subsidiaries	(7,637,347)	(7,576,634)
Property, plant and equipment, net	0	0
Intangible assets, net	0	0
Goodwill	0	0
Investment in unconsolidated subsidiaries	0	0
Other assets	(49,532)	(50,164)
Deferred income taxes	0	0
Total assets	(8,566,907)	(8,512,029)
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current portion of long-term debt	(20,240)	(18,913)
Accounts payable	(859,774)	(866,257)
Income taxes payable	0	0
Accrued expenses	(14)	(61)
Total current liabilities	(880,028)	(885,231)
Long-term debt, net of current portion	(49,532)	(50,164)
Other non-current liabilities	0	0
Deferred income taxes	0	0
Total liabilities	(929,560)	(935,395)
Total stockholders’ equity	(7,637,347)	(7,576,634)
Total liabilities and stockholders' equity	$ (8,566,907)	$ (8,512,029)