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Subsequent Events Subsequent Events	9 Months Ended
Subsequent Events Subsequent Events	Dec. 02, 2017
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Refer to Note 2—Business and Asset Acquisitions for information regarding the acquisition of Associated Grocers of Florida, Inc. On December 22, 2017, the Tax Cuts and Jobs Act was enacted into law, which changes various corporate income tax provisions within the existing Internal Revenue Code. The law is required to be accounted for in the period of enactment, which for Supervalu is the fourth quarter of fiscal 2018. Supervalu is continuing to analyze the impacts to its consolidated financial statements. Supervalu currently estimates it will be required to reduce its net deferred tax assets, resulting in a non-cash income tax charge of approximately $35 to $45 in the fourth quarter of fiscal 2018 due to the reduction in the federal income tax rate from 35 percent to 21 percent. Other provisions of the Tax Cuts and Jobs Act are not expected to have a material impact on the fiscal 2018 consolidated financial statements.