Net (Loss) Earnings 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. 09, 2017	Sep. 10, 2016	Sep. 09, 2017	Sep. 10, 2016
Pro forma Schedule of Basic and Diluted earnings per share [Line Items]
Net (loss) earnings from continuing operations attributable to SUPERVALU INC.			$ (13)	$ 30
Income from discontinued operations, net of tax			0	49
SUPERVALU Inc.
Pro forma Schedule of Basic and Diluted earnings per share [Line Items]
Net earnings from continuing operations	$ (25)	$ 12	(13)	32
Less net earnings attributable to noncontrolling interests	0	(1)	(1)	(2)
Net (loss) earnings from continuing operations attributable to SUPERVALU INC.	(25)	11	(14)	30
Income from discontinued operations, net of tax	0	20	0	47
Net (loss) earnings attributable to SUPERVALU INC.	$ (25)	$ 31	$ (14)	$ 77
Weighted average number of shares outstanding-basic	38	38	38	38
Dilutive impact of stock-based awards	0	0	0	0
Weighted average number of shares outstanding-diluted	38	38	38	38
Basic net (loss) earnings per share attributable to SUPERVALU INC.:(1)
Continuing operations (in dollars per share)	$ (0.65)	$ 0.30	$ (0.35)	$ 0.79
Discontinued operations (in dollars per share)	0.00	0.52	(0.01)	1.24
Basic net earnings per share (in dollars per share)	(0.65)	0.82	(0.36)	2.04
Diluted net (loss) earnings per share attributable to SUPERVALU INC.:(1)
Continuing operations (in dollars per share)	(0.65)	0.29	(0.35)	0.79
Discontinued operations (in dollars per share)	0.00	0.52	(0.01)	1.23
Diluted net earnings per share (in dollars per share)	$ (0.65)	$ 0.81	$ (0.36)	$ 2.02