Business Acquisitions - Additional Information (Detail) (USD $)	4 Months Ended
	Jun. 14, 2014
Asset Purchase Agreement [Member] | Trademarks and Tradenames - Indefinite Useful Lives [Member]
Business Acquisition [Line Items]
Total payment related to acquisition	$ 33
Cash payment related to acquisition	5
Asset Purchase Agreement [Member] | Rainbow Foods grocery stores [Member]
Business Acquisition [Line Items]
Number of stores acquired	7
Asset Purchase Agreement [Member] | Rainbow Foods grocery stores [Member] | Minority interest [Member]
Business Acquisition [Line Items]
Number of stores acquired	3
Asset Purchase Agreement [Member] | Rainbow Foods pharmacy locations [Member]
Business Acquisition [Line Items]
Number of stores acquired	11
Asset Purchase Agreement [Member] | Rainbow Foods liquor store [Member]
Business Acquisition [Line Items]
Number of stores acquired	1
Asset Purchase Agreement [Member] | Diamond Lake 1994 L.L.C [Member]
Business Acquisition [Line Items]
Number of stores acquired	3
Save-A-Lot Licensee Stores [Member]
Business Acquisition [Line Items]
Cash payment related to acquisition	$ 5,000,000
Number of stores	14