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BUSINESS ACQUISITIONS - Proforma Results from Acquisition (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 24, 2018
Feb. 25, 2017
Business Acquisition [Line Items]    
Net sales $ 15,892 $ 15,323
Net earnings from continuing operations attributable to SUPERVALU INC. $ 48 $ 20
Basic net earnings from continuing operations per share attributable to SUPERVALU INC. (in usd per share $ 1.24 $ 0.52
Diluted net earnings from continuing operations per share attributable to SUPERVALU INC. (in usd per share $ 1.24 $ 0.52