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. 12, 2015	Sep. 06, 2014	Sep. 12, 2015	Sep. 06, 2014
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	$ 31	$ 31	$ 94	$ 79
Less net earnings attributable to noncontrolling interests	2	2	5	4
Net earnings (loss) from continuing operations	29	29	89	75
Income (loss) from discontinued operations, net of tax	2	2	3	(1)
Net earnings attributable to SUPERVALU INC.	$ 31	$ 31	$ 92	$ 74
Weighted average number of shares outstanding-basic	263	260	262	260
Dilutive impact of stock-based awards	5	4	6	3
Weighted average number of shares outstanding-diluted	268	264	268	263
Basic net earnings (loss) per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	$ 0.11	$ 0.11	$ 0.34	$ 0.29
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	0.35	0.28
Diluted net earnings (loss) per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	0.11	0.11	0.33	0.29
Discontinued operations (in dollars per share)	0.01	0.01	0.01	(0.01)
Diluted net earnings per share (in dollars per share)	$ 0.11	$ 0.11	$ 0.34	$ 0.28