Sales by Sales Channel Category in Each Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended										4 Months Ended				12 Months Ended
	Dec. 29, 2018	Oct. 06, 2018	[1]	Jul. 14, 2018	[1]	Dec. 30, 2017	Oct. 07, 2017	[1]	Jul. 15, 2017	[1]	Apr. 21, 2018	[1]	Apr. 22, 2017	[1]	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Sales	$ 880,667	$ 923,449		$ 941,283		$ 873,623	$ 932,822		$ 926,639		$ 1,206,453		$ 1,187,649		$ 3,951,852	$ 3,920,733	$ 3,926,885
DSD Segment
Segment Reporting Information [Line Items]
Sales															3,340,047	3,318,563	3,284,177
Warehouse Segment
Segment Reporting Information [Line Items]
Sales															611,805	602,170	642,708
Branded Retail
Segment Reporting Information [Line Items]
Sales															2,335,831	2,303,301	2,283,526
Branded Retail | DSD Segment
Segment Reporting Information [Line Items]
Sales															2,188,638	2,149,451	2,114,142
Branded Retail | Warehouse Segment
Segment Reporting Information [Line Items]
Sales															147,193	153,850	169,384
Store Branded Retail
Segment Reporting Information [Line Items]
Sales															597,147	582,738	582,280
Store Branded Retail | DSD Segment
Segment Reporting Information [Line Items]
Sales															483,001	471,199	464,456
Store Branded Retail | Warehouse Segment
Segment Reporting Information [Line Items]
Sales															114,146	111,539	117,824
Non-Retail and Other
Segment Reporting Information [Line Items]
Sales															1,018,874	1,034,694	1,061,079
Non-Retail and Other | DSD Segment
Segment Reporting Information [Line Items]
Sales															668,408	697,913	705,579
Non-Retail and Other | Warehouse Segment
Segment Reporting Information [Line Items]
Sales															$ 350,466	$ 336,781	$ 355,500

[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.