Information Regarding Operations in Reportable Segments (Detail) - USD ($) $ 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
Segment Reporting Information [Line Items]
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
Gain on divestiture		$ 28,875																$ 28,875			28,875
Multi-employer pension plan withdrawal costs									18,268							2,322				2,322	18,268
Loss on inferior ingredients			1,219	(1,891)		3,884														3,212
Restructuring and related impairment charges																				9,767	104,130
Impairment of assets			3,516													2,483				5,999		24,877
Depreciation and amortization																				144,124	146,719	140,869
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
Capital expenditures																				99,422	75,232	101,727
Unallocated Corporate Costs
Segment Reporting Information [Line Items]
Restructuring and related impairment charges																				252	3,982
Impairment of assets																				3,516
Depreciation and amortization	[2]																			300	(408)	722
Income from operations	[3]																			(64,812)	(95,974)	(53,549)
Capital expenditures	[4]																			1,704	3,982	23,266
DSD Segment
Segment Reporting Information [Line Items]
Sales																				3,340,047	3,318,563	3,284,177
Loss on inferior ingredients																				1,655
DSD Segment | Operating Segments
Segment Reporting Information [Line Items]
Sales																				3,423,935	3,383,564	3,347,616
Multi-employer pension plan withdrawal costs																				2,322	18,268
Loss on inferior ingredients																				1,655
Restructuring and related impairment charges																				8,121	80,026
Impairment of assets																				2,483		24,877
Depreciation and amortization																				122,300	126,485	120,009
Income from operations																				239,510	202,239	259,982
Capital expenditures																				82,789	64,317	61,669
DSD Segment | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales																				(83,888)	(65,001)	(63,439)
Warehouse Segment
Segment Reporting Information [Line Items]
Sales																				611,805	602,170	642,708
Loss on inferior ingredients																				1,557
Warehouse Segment | Operating Segments
Segment Reporting Information [Line Items]
Sales																				787,431	767,844	787,233
Gain on divestiture																					28,875
Loss on inferior ingredients																				1,557
Restructuring and related impairment charges																				1,394	20,122
Depreciation and amortization																				21,524	20,642	20,138
Income from operations																				37,646	54,738	58,465
Capital expenditures																				14,929	6,933	16,792
Warehouse Segment | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales																				$ (175,626)	$ (165,674)	$ (144,525)

[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] Represents costs allocated to the company’s corporate head office.

[3] Represents costs allocated to the company’s corporate head office and pension settlement loss.

[4] Represents the company’s corporate head office assets including primarily cash and cash equivalents.