Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended															4 Months Ended				12 Months Ended
	Jan. 14, 2017	Dec. 29, 2018		Oct. 06, 2018		Jul. 14, 2018		Dec. 30, 2017		Oct. 07, 2017		Jul. 15, 2017	[1]	Dec. 31, 2016	Oct. 08, 2016	Jul. 16, 2016	Apr. 21, 2018		Apr. 22, 2017		Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Income Statement [Abstract]
Sales		$ 880,667		$ 923,449	[1]	$ 941,283	[1]	$ 873,623		$ 932,822	[1]	$ 926,639					$ 1,206,453	[1]	$ 1,187,649	[1]	$ 3,951,852	$ 3,920,733	$ 3,926,885
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately below)		467,155	[2]	485,680	[1],[2]	488,871	[1],[2]	456,895	[2]	476,264	[1],[2]	468,246	[2]				625,122	[1],[2]	608,068	[1],[2]	2,066,828	2,009,473	2,026,859
Selling, distribution and administrative expenses																					1,507,256	1,510,015	1,469,382
Depreciation and amortization																					144,124	146,719	140,869
Restructuring and related impairment charges		7,210		497		801		3,581		100,549							1,259				9,767	104,130
Gain on divestiture	$ (28,875)																		(28,875)			(28,875)
Loss on inferior ingredients		1,219		(1,891)		3,884															3,212
Multi-employer pension plan withdrawal costs										18,268							2,322				2,322	18,268
Impairment of assets		3,516															2,483				5,999		24,877
Income from operations																					212,344	161,003	264,898
Interest expense																					35,686	36,557	34,905
Interest income																					(27,755)	(22,938)	(20,552)
Pension plan settlement loss		1,148		930		1,035		1,619		3,030				$ 173	$ 1,832	$ 4,641	4,668				7,781	4,649	6,646
Other components of net periodic pension and postretirement benefits credit																					(529)	(6,558)	(5,638)
Income before income taxes																					197,161	149,293	249,537
Income tax expense (benefit)																					40,001	(827)	85,761
Net income		$ 20,841		$ 39,630	[1]	$ 45,442	[1]	$ 78,533		$ (33,571)	[1]	$ 44,740					$ 51,247	[1]	$ 60,418	[1]	$ 157,160	$ 150,120	$ 163,776
Basic:
Net income per common share		$ 0.10		$ 0.19	[1]	$ 0.22	[1]	$ 0.37		$ (0.16)	[1]	$ 0.21					$ 0.24	[1]	$ 0.29	[1]	$ 0.74	$ 0.72	$ 0.79
Weighted average shares outstanding																					211,016	209,573	208,511
Diluted:
Net income per common share		$ 0.10		$ 0.19	[1]	$ 0.21	[1]	$ 0.37		$ (0.16)	[1]	$ 0.21					$ 0.24	[1]	$ 0.29	[1]	$ 0.74	$ 0.71	$ 0.78
Weighted average shares outstanding																					211,632	210,435	210,354
Cash dividends paid per common share																					$ 0.7100	$ 0.6700	$ 0.6250

[1] As disclosed in Note 4, Financial Statement Revisions, the company reported cash receipts and payments for the repurchase and sale of territories and cash paid at issuance of notes receivable at net when these transactions should have been disaggregated. We concluded that the errors were not material to any of these prior periods that were impacted. The error resulted in an understatement of cash flows from operating activities and cash flows used in investing activities of $5.9 million, $12.1 million and $12.8 million, respectively, for the sixteen, twenty-eight, and forty-week amounts included in the first, second, and third quarters of fiscal 2017, respectively.  These amounts were revised upon subsequent presentation of these financial statements.

[2] The company does not report gross margin. This line item presents our material, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately) under an alternative presentation.