Business Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended
	Sep. 06, 2014	Sep. 06, 2014 Save-A-Lot Licensee Stores [Member] Store	Sep. 06, 2014 Rainbow Foods grocery stores [Member] Store	Sep. 06, 2014 Rainbow Foods grocery stores [Member] Minority Interest [Member] Store	Sep. 06, 2014 Rainbow Foods pharmacy locations [Member] Store	Sep. 06, 2014 Rainbow Foods liquor store [Member] Store	Sep. 06, 2014 Diamond Lake 1994 L.L.C [Member] Store
Business Acquisition [Line Items]
Number of stores acquired			7	2	11	1	3
Total payment related to acquisition	$ 34
Cash payment related to acquisition	5	10
Fair value of assets acquired	39
Fair value of Inventories acquired	5
Fair value of Other current assets acquired	1
Fair value of Property, plant and equipment acquired	15
Fair value of Identifiable finite-lived intangible assets acquired	4
Fair value of Goodwill acquired	$ 14
Number of stores		22