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	4 Months Ended
	Jun. 20, 2015	Jun. 14, 2014
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	$ 63	$ 48
Less net earnings attributable to noncontrolling interests	3	2
Net earnings (loss) from continuing operations	60	46
Income (loss) from discontinued operations, net of tax	1	(3)
Net earnings attributable to SUPERVALU INC.	$ 61	$ 43
Weighted average number of shares outstanding-basic	262	260
Dilutive impact of stock-based awards	6	2
Weighted average number of shares outstanding-diluted	268	262
Basic net earnings (loss) per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	$ 0.23	$ 0.18
Discontinued operations (in dollars per share)	0.00	(0.01)
Basic net earnings per share (in dollars per share)	0.23	0.17
Diluted net earnings (loss) per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	0.23	0.18
Discontinued operations (in dollars per share)	0.00	(0.01)
Diluted net earnings per share (in dollars per share)	$ 0.23	$ 0.17