Document and Entity Information - USD ($)	12 Months Ended
	Feb. 25, 2017	Apr. 21, 2017	Sep. 09, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Feb. 25, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	SVU
Entity Registrant Name	SUPERVALU INC
Entity Central Index Key	0000095521
Current Fiscal Year End Date	--02-25
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		267,676,000
Entity Public Float			$ 1,248,780,826