Sales by Product Category in Each Reportable Segment (Detail) - USD ($) $ in Thousands	4 Months Ended
	Apr. 23, 2016	Apr. 25, 2015
Segment Reporting Information [Line Items]
Sales	$ 1,204,352	$ 1,146,045
DSD Segment
Segment Reporting Information [Line Items]
Sales	999,003	966,163
Warehouse Segment
Segment Reporting Information [Line Items]
Sales	205,349	179,882
Branded Retail
Segment Reporting Information [Line Items]
Sales	699,965	650,363
Branded Retail | DSD Segment
Segment Reporting Information [Line Items]
Sales	641,698	610,729
Branded Retail | Warehouse Segment
Segment Reporting Information [Line Items]
Sales	58,267	39,634
Store Branded Retail
Segment Reporting Information [Line Items]
Sales	171,233	168,462
Store Branded Retail | DSD Segment
Segment Reporting Information [Line Items]
Sales	132,971	133,168
Store Branded Retail | Warehouse Segment
Segment Reporting Information [Line Items]
Sales	38,262	35,294
Non-Retail and Other
Segment Reporting Information [Line Items]
Sales	333,154	327,220
Non-Retail and Other | DSD Segment
Segment Reporting Information [Line Items]
Sales	224,334	222,266
Non-Retail and Other | Warehouse Segment
Segment Reporting Information [Line Items]
Sales	$ 108,820	$ 104,954