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Reporting Segment Information - Summary of Sales by Type of Similar Products and Services (Detail) - USD ($) $ in Thousands	3 Months Ended						4 Months Ended		9 Months Ended	12 Months Ended
	Jan. 02, 2016	Oct. 10, 2015	Jul. 18, 2015	Jan. 03, 2015	Oct. 04, 2014	Jul. 12, 2014	Apr. 25, 2015	Apr. 19, 2014	Dec. 28, 2013	Jan. 02, 2016	Jan. 03, 2015
Revenue from External Customer [Line Items]
Consolidated net sales	$ 1,768,025	$ 1,775,401	$ 1,795,864	$ 1,962,589	$ 1,809,571	$ 1,810,175	$ 2,312,683	$ 2,333,727	$ 2,597,230	$ 7,651,973	$ 7,916,062
Sales Revenue [Member] | Product Concentration Risk [Member]
Revenue from External Customer [Line Items]
Consolidated net sales, Percentage									100.00%	100.00%	100.00%
Fuel [Member]
Revenue from External Customer [Line Items]
Consolidated net sales									$ 145,631	$ 122,004	$ 178,111
Fuel [Member] | Sales Revenue [Member] | Product Concentration Risk [Member]
Revenue from External Customer [Line Items]
Consolidated net sales, Percentage									5.60%	1.60%	2.20%
Non Perishables [Member]
Revenue from External Customer [Line Items]
Consolidated net sales									$ 1,393,157	$ 4,845,763	$ 4,998,895
Non Perishables [Member] | Sales Revenue [Member] | Product Concentration Risk [Member]
Revenue from External Customer [Line Items]
Consolidated net sales, Percentage									53.60%	63.30%	63.10%
Perishables [Member]
Revenue from External Customer [Line Items]
Consolidated net sales									$ 894,783	$ 2,373,829	$ 2,449,562
Perishables [Member] | Sales Revenue [Member] | Product Concentration Risk [Member]
Revenue from External Customer [Line Items]
Consolidated net sales, Percentage									34.50%	31.00%	31.00%
Pharmacy [Member]
Revenue from External Customer [Line Items]
Consolidated net sales									$ 163,659	$ 310,377	$ 289,494
Pharmacy [Member] | Sales Revenue [Member] | Product Concentration Risk [Member]
Revenue from External Customer [Line Items]
Consolidated net sales, Percentage									6.30%	4.10%	3.70%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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