Information Regarding Operations in Reportable Segments (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
Depreciation and amortization		47,188	43,467
Income (loss) from operations		100,125	95,156
Interest expense		(11,625)	(9,068)
Interest income		6,577	6,290
Income before income taxes		95,077	92,378
Unallocated Corporate Costs
Segment Reporting Information [Line Items]
Depreciation and amortization	[1]	(185)	115
Income (loss) from operations	[1]	(31,964)	(15,534)
DSD Segment
Segment Reporting Information [Line Items]
Sales		999,860	999,003
DSD Segment | Operating Segments
Segment Reporting Information [Line Items]
Sales		1,018,916	1,018,348
Depreciation and amortization		41,062	37,074
Income (loss) from operations		87,394	91,949
DSD Segment | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales		(19,056)	(19,345)
Warehouse Segment
Segment Reporting Information [Line Items]
Sales		187,789	205,349
Warehouse Segment | Operating Segments
Segment Reporting Information [Line Items]
Sales		237,676	248,204
Depreciation and amortization		6,311	6,278
Income (loss) from operations		44,695	18,741
Warehouse Segment | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales		$ (49,887)	$ (42,855)

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