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. 18, 2016	Jun. 20, 2015
Earnings Per Share [Abstract]
Net earnings from continuing operations	$ 47	$ 63
Less net earnings attributable to noncontrolling interests	1	3
Net earnings from continuing operations	46	60
Income from discontinued operations, net of tax	0	1
Net earnings attributable to SUPERVALU INC.	$ 46	$ 61
Weighted average number of shares outstanding-basic	264	262
Dilutive impact of stock-based awards	3	6
Weighted average number of shares outstanding-diluted	267	268
Basic net earnings per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	$ 0.17	$ 0.23
Discontinued operations (in dollars per share)	0.00	0.00
Basic net earnings per share (in dollars per share)	0.17	0.23
Diluted net earnings per share attributable to SUPERVALU INC.:
Continuing operations (in dollars per share)	0.17	0.23
Discontinued operations (in dollars per share)	0.00	0.00
Diluted net earnings per share (in dollars per share)	$ 0.17	$ 0.23