Sales by Product Category in Each Reportable Segment (Detail) - USD ($) $ in Thousands	4 Months Ended
	Apr. 22, 2017	Apr. 23, 2016
Segment Reporting Information [Line Items]
Sales	$ 1,187,649	$ 1,204,352
DSD Segment
Segment Reporting Information [Line Items]
Sales	999,860	999,003
Warehouse Segment
Segment Reporting Information [Line Items]
Sales	187,789	205,349
Branded Retail
Segment Reporting Information [Line Items]
Sales	693,578	700,380
Branded Retail | DSD Segment
Segment Reporting Information [Line Items]
Sales	646,103	642,058
Branded Retail | Warehouse Segment
Segment Reporting Information [Line Items]
Sales	47,475	58,322
Store Branded Retail
Segment Reporting Information [Line Items]
Sales	172,024	171,246
Store Branded Retail | DSD Segment
Segment Reporting Information [Line Items]
Sales	137,524	132,984
Store Branded Retail | Warehouse Segment
Segment Reporting Information [Line Items]
Sales	34,500	38,262
Non-Retail and Other
Segment Reporting Information [Line Items]
Sales	322,047	332,726
Non-Retail and Other | DSD Segment
Segment Reporting Information [Line Items]
Sales	216,233	223,961
Non-Retail and Other | Warehouse Segment
Segment Reporting Information [Line Items]
Sales	$ 105,814	$ 108,765