Business Acquisitions Schedule of Pro-Forma Information (Details) - SUPERVALU Inc. - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Dec. 03, 2016	Dec. 02, 2017	Dec. 03, 2016
Business Combination Segment Allocation [Line Items]
Net sales	$ 3,906	$ 12,972	$ 12,509
Net (loss) earnings from continuing operations attributable to SUPERVALU INC.	$ (11)	$ 6	$ 13
Basic net (loss) earnings from continuing operations per share attributable to SUPERVALU INC. (earnings per share)	$ (0.30)	$ 0.15	$ 0.33
Diluted net (loss) earnings from continuing operations per share attributable to SUPERVALU INC. (earnings per share)	$ (0.30)	$ 0.15	$ 0.33

Per basic share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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Per diluted share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

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