Information Regarding Operations in Reportable Segments (Detail) - USD ($) $ in Thousands			3 Months Ended		4 Months Ended		6 Months Ended
		Jan. 14, 2017	Jul. 14, 2018	Jul. 15, 2017	Apr. 21, 2018	Apr. 22, 2017	Jul. 14, 2018	Jul. 15, 2017
Segment Reporting Information [Line Items]
Sales			$ 941,283	$ 926,639			$ 2,147,736	$ 2,114,288
Gain on divestiture		$ 28,875				$ 28,900		28,875
Multi-employer pension plan withdrawal costs							2,322
Loss on inferior ingredients			3,884				3,884
Restructuring charges			801				2,060
Impairment of assets					$ 2,500		2,483
Depreciation and amortization			35,098	34,128			79,287	81,316
Income from operations			52,264	68,723			128,879	166,925
Interest expense			(8,214)	(8,436)			(19,210)	(20,061)
Interest income			6,466	5,158			14,561	11,735
Pension plan settlement loss			(1,035)		$ (4,668)		(5,703)
Other components of net periodic pension and postretirement benefits credit			298	1,443			1,033	3,366
Income before income taxes			49,779	66,888			119,560	161,965
Operating Segments
Segment Reporting Information [Line Items]
Gain on divestiture								28,875
Unallocated Corporate Costs
Segment Reporting Information [Line Items]
Restructuring charges			58				86
Depreciation and amortization	[1]		69	12			163	(173)
Income from operations	[2]		(13,352)	(22,331)			(35,724)	(56,085)
DSD Segment
Segment Reporting Information [Line Items]
Sales			796,626	792,892			1,812,110	1,792,752
Loss on inferior ingredients			3,884
DSD Segment | Operating Segments
Segment Reporting Information [Line Items]
Sales			818,998	806,296			1,860,367	1,825,212
Multi-employer pension plan withdrawal costs							2,322
Loss on inferior ingredients			3,884				3,884
Restructuring charges			694				1,898
Impairment of assets							2,483
Depreciation and amortization			30,127	29,355			67,597	70,417
Income from operations			54,481	79,465			138,906	166,726
DSD Segment | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales			(22,372)	(13,404)			(48,257)	(32,460)
Warehouse Segment
Segment Reporting Information [Line Items]
Sales			144,657	133,747			335,626	321,536
Warehouse Segment | Operating Segments
Segment Reporting Information [Line Items]
Sales			187,078	173,844			432,891	411,521
Restructuring charges			49				76
Depreciation and amortization			4,902	4,761			11,527	11,072
Income from operations			11,135	11,589			25,697	56,284
Warehouse Segment | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales			$ (42,421)	$ (40,097)			$ (97,265)	$ (89,985)

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

[2] Represents costs allocated to the company’s corporate head office and pension plan settlement loss.