Information Regarding Operations in Reportable Segments (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 16, 2016	Jul. 18, 2015	Jul. 16, 2016	Jul. 18, 2015
Segment Reporting Information [Line Items]
Sales		$ 935,025	$ 888,795	$ 2,139,377	$ 2,034,840
Depreciation and amortization		32,598	30,468	76,065	70,285
Income (loss) from operations		81,435	80,041	176,591	176,579
Interest expense		(7,649)	(5,998)	(16,717)	(14,357)
Interest income		4,639	5,138	10,929	11,915
Income before income taxes		78,425	79,181	170,803	174,137
Unallocated Corporate Costs
Segment Reporting Information [Line Items]
Depreciation and amortization	[1]	19	(118)	134	(261)
Income (loss) from operations	[1]	(14,410)	(12,006)	(29,944)	(30,960)
DSD Segment
Segment Reporting Information [Line Items]
Sales		785,767	751,969	1,784,770	1,718,132
DSD Segment | Operating Segments
Segment Reporting Information [Line Items]
Sales		799,890	765,822	1,818,238	1,752,391
Depreciation and amortization		27,980	26,995	65,054	62,175
Income (loss) from operations		80,135	78,071	172,084	177,265
DSD Segment | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales		(14,123)	(13,853)	(33,468)	(34,259)
Warehouse Segment
Segment Reporting Information [Line Items]
Sales		149,258	136,826	354,607	316,708
Warehouse Segment | Operating Segments
Segment Reporting Information [Line Items]
Sales		184,887	167,012	433,092	391,746
Depreciation and amortization		4,599	3,591	10,877	8,371
Income (loss) from operations		15,710	13,976	34,451	30,274
Warehouse Segment | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales		$ (35,629)	$ (30,186)	$ (78,485)	$ (75,038)

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