Summary of Significant Accounting Policies (Policies)	4 Months Ended
Jun. 16, 2018
Accounting Policies [Abstract]
Statement of Registrant	Statement of Registrant The accompanying Condensed Consolidated Financial Statements of SUPERVALU INC. (“Supervalu”, the “Company”, “we”, “us”, or “our”) for the first quarters ended June 16, 2018 and June 17, 2017 are unaudited and, in the opinion of management, contain all adjustments that are of a normal and recurring nature necessary to present fairly the financial condition, results of operations and cash flows for such periods. The Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and related notes in our Annual Report on Form 10-K for the fiscal year ended February 24, 2018. The results of operations for the first quarter ended June 16, 2018 are not necessarily indicative of the results expected for the full year.
Accounting Policies	Accounting Policies The summary of significant accounting policies is included in the Notes to Consolidated Financial Statements set forth in our Annual Report on Form 10-K for the fiscal year ended February 24, 2018.
Fiscal Year	Fiscal Year Our fiscal years end on the last Saturday of February and contain either 52 or 53 weeks. References to the first quarter of fiscal 2019 and 2018 relate to the 16 week fiscal quarters ended June 16, 2018 and June 17, 2017, respectively.
Use of Estimates	Use of Estimates The preparation of our Condensed Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly liquid investments with a maturity of three months or less at the time of purchase to be cash equivalents. Our banking arrangements allow us to fund outstanding checks when presented to the financial institution for payment. We fund all intraday bank balance overdrafts during the same business day. Checks outstanding in excess of bank balances create net book overdrafts, which are recorded in Accounts payable in the Condensed Consolidated Balance Sheets and are reflected as an operating activity in the Condensed Consolidated Statements of Cash Flows. As of June 16, 2018 and February 24, 2018, we had net book overdrafts of $116 and $144, respectively.
Inventories, Net	Inventories, Net Inventories are valued at the lower of cost or market. Substantially all of our inventories consist of finished goods and a substantial portion of our inventories have a last-in, first-out (“LIFO”) reserve applied. Interim LIFO calculations are based on our estimates of expected year-end inventory levels and costs, as the actual valuation of inventory under the LIFO method is computed at the end of each year based on the inventory levels and costs at that time. If the first-in, first-out method had been used, Inventories, net would have been higher by approximately $201 and $199 at June 16, 2018 and February 24, 2018, respectively. We recorded a LIFO charge of $2 and $1 for the first quarters ended June 16, 2018 and June 17, 2017, respectively.

Summary of Significant Accounting Policies (Policies)

4 Months Ended

Jun. 16, 2018

The accompanying Condensed Consolidated Financial Statements of SUPERVALU INC. (“Supervalu”, the “Company”, “we”, “us”, or “our”) for the first quarters ended June 16, 2018 and June 17, 2017 are unaudited and, in the opinion of management, contain all adjustments that are of a normal and recurring nature necessary to present fairly the financial condition, results of operations and cash flows for such periods. The Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and related notes in our Annual Report on Form 10-K for the fiscal year ended February 24, 2018. The results of operations for the first quarter ended June 16, 2018 are not necessarily indicative of the results expected for the full year.

Accounting Policies

The summary of significant accounting policies is included in the Notes to Consolidated Financial Statements set forth in our Annual Report on Form 10-K for the fiscal year ended February 24, 2018.

Fiscal Year

Our fiscal years end on the last Saturday of February and contain either 52 or 53 weeks. References to the first quarter of fiscal 2019 and 2018 relate to the 16 week fiscal quarters ended June 16, 2018 and June 17, 2017, respectively.

Use of Estimates

The preparation of our Condensed Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Cash and Cash Equivalents

We consider all highly liquid investments with a maturity of three months or less at the time of purchase to be cash equivalents. Our banking arrangements allow us to fund outstanding checks when presented to the financial institution for payment. We fund all intraday bank balance overdrafts during the same business day. Checks outstanding in excess of bank balances create net book overdrafts, which are recorded in Accounts payable in the Condensed Consolidated Balance Sheets and are reflected as an operating activity in the Condensed Consolidated Statements of Cash Flows. As of June 16, 2018 and February 24, 2018, we had net book overdrafts of $116 and $144, respectively.

Inventories, Net

Inventories are valued at the lower of cost or market. Substantially all of our inventories consist of finished goods and a substantial portion of our inventories have a last-in, first-out (“LIFO”) reserve applied. Interim LIFO calculations are based on our estimates of expected year-end inventory levels and costs, as the actual valuation of inventory under the LIFO method is computed at the end of each year based on the inventory levels and costs at that time. If the first-in, first-out method had been used, Inventories, net would have been higher by approximately $201 and $199 at June 16, 2018 and February 24, 2018, respectively. We recorded a LIFO charge of $2 and $1 for the first quarters ended June 16, 2018 and June 17, 2017, respectively.