Net Earnings 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. 17, 2017	Jun. 18, 2016
Earnings Per Share [Abstract]
Net earnings from continuing operations	$ 12	$ 20
Less net earnings attributable to noncontrolling interests	(1)	(1)
Net earnings from continuing operations	11	19
Income from discontinued operations, net of tax	0	27
Net earnings attributable to SUPERVALU INC.	$ 11	$ 46
Weighted average number of shares outstanding-basic	267	264
Dilutive impact of stock-based awards	2	3
Weighted average number of shares outstanding-diluted	269	267
Basic net earnings per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	$ 0.04	$ 0.07
Discontinued operations (in dollars per share)	0.00	0.10
Basic net earnings per share (in dollars per share)	0.04	0.17
Diluted net earnings per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	0.04	0.07
Discontinued operations (in dollars per share)	0.00	0.10
Diluted net earnings per share (in dollars per share)	$ 0.04	$ 0.17