Net Earnings (Loss) Per Share - Calculation of Basic and Diluted Net Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 10, 2016	Sep. 12, 2015	Sep. 10, 2016	Sep. 12, 2015
Earnings Per Share [Abstract]
Net earnings from continuing operations	$ 30	$ 31	$ 77	$ 94
Less net earnings attributable to noncontrolling interests	(1)	(2)	(2)	(5)
Net earnings from continuing operations	29	29	75	89
Income from discontinued operations, net of tax	2	2	2	3
Net earnings attributable to SUPERVALU INC.	$ 31	$ 31	$ 77	$ 92
Weighted average number of shares outstanding-basic	265	263	264	262
Dilutive impact of stock-based awards	2	5	3	6
Weighted average number of shares outstanding-diluted	267	268	267	268
Basic net earnings per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	$ 0.11	$ 0.11	$ 0.28	$ 0.34
Discontinued operations (in dollars per share)	0.01	0.01	0.01	0.01
Basic net earnings per share (in dollars per share)	0.12	0.12	0.29	0.35
Diluted net earnings per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	0.11	0.11	0.28	0.33
Discontinued operations (in dollars per share)	0.01	0.01	0.01	0.01
Diluted net earnings per share (in dollars per share)	$ 0.12	$ 0.11	$ 0.29	$ 0.34