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		9 Months Ended
	Dec. 02, 2017	Dec. 03, 2016	Dec. 02, 2017	Dec. 03, 2016
Pro forma Schedule of Basic and Diluted earnings per share [Line Items]
Net earnings (loss) from continuing operations	$ 18	$ (11)	$ 5	$ 21
Less net earnings attributable to noncontrolling interests	0	(1)	(1)	(3)
Net earnings (loss) from continuing operations attributable to SUPERVALU INC.	18	(12)	4	18
Income (loss) from discontinued operations, net of tax	8	(14)	8	33
Net earnings (loss) attributable to SUPERVALU INC.	$ 26	$ (26)	$ 12	$ 51
Weighted average number of shares outstanding-basic	38	38	38	38
Weighted average number of shares outstanding-diluted	38	38	38	38
Basic net earnings (loss) per share attributable to SUPERVALU INC.:(1)
Continuing operations (in dollars per share)	$ 0.47	$ (0.31)	$ 0.12	$ 0.49
Discontinued operations (in dollars per share)	0.21	(0.39)	0.20	0.85
Basic net earnings per share (in dollars per share)	0.67	(0.69)	0.32	1.34
Diluted net earnings (loss) per share attributable to SUPERVALU INC.:(1)
Continuing operations (in dollars per share)	0.46	(0.31)	0.12	0.48
Discontinued operations (in dollars per share)	0.21	(0.39)	0.20	0.84
Diluted net earnings per share (in dollars per share)	$ 0.67	$ (0.69)	$ 0.31	$ 1.33
SUPERVALU Inc.
Pro forma Schedule of Basic and Diluted earnings per share [Line Items]
Dilutive impact of stock-based awards	0	0	0	0