Information Regarding Operations in Reportable Segments (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 15, 2017	Jul. 16, 2016	Jul. 15, 2017	Jul. 16, 2016
Segment Reporting Information [Line Items]
Sales		$ 926,639	$ 935,025	$ 2,114,288	$ 2,139,377
Depreciation and amortization		34,128	32,598	81,316	76,065
Income (loss) from operations		70,166	81,435	170,291	176,591
Interest expense		(8,436)	(7,649)	(20,061)	(16,717)
Interest income		5,158	4,639	11,735	10,929
Income before income taxes		66,888	78,425	161,965	170,803
Unallocated Corporate Costs
Segment Reporting Information [Line Items]
Depreciation and amortization	[1]	12	19	(173)	134
Income (loss) from operations	[1]	(20,987)	(14,410)	(52,951)	(29,944)
DSD Segment
Segment Reporting Information [Line Items]
Sales		792,892	785,767	1,792,752	1,784,770
DSD Segment | Operating Segments
Segment Reporting Information [Line Items]
Sales		806,296	799,890	1,825,212	1,818,238
Depreciation and amortization		29,355	27,980	70,417	65,054
Income (loss) from operations		79,564	80,135	166,958	172,084
DSD Segment | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales		(13,404)	(14,123)	(32,460)	(33,468)
Warehouse Segment
Segment Reporting Information [Line Items]
Sales		133,747	149,258	321,536	354,607
Warehouse Segment | Operating Segments
Segment Reporting Information [Line Items]
Sales		173,844	184,887	411,521	433,092
Depreciation and amortization		4,761	4,599	11,072	10,877
Income (loss) from operations		11,589	15,710	56,284	34,451
Warehouse Segment | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales		$ (40,097)	$ (35,629)	$ (89,985)	$ (78,485)

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