Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 05, 2015
Accounting Policies [Abstract]
Statement of Registrant	Statement of Registrant The accompanying Condensed Consolidated Financial Statements of SUPERVALU INC. (“SUPERVALU” or the “Company”) for the third quarters and year-to-date periods ended December 5, 2015 and November 29, 2014 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 the Company’s Annual Report on Form 10-K for the fiscal year ended February 28, 2015. The results of operations for the third quarter and year-to-date ended December 5, 2015 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 the Company’s Annual Report on Form 10-K for the fiscal year ended February 28, 2015.
Fiscal Year	Fiscal Year The Company operates on a 52/53 week fiscal year basis, with its fiscal year ending on the last Saturday in February. References to the third quarters of fiscal 2016 and 2015 relate to the 12 week fiscal quarters ended December 5, 2015 and November 29, 2014, respectively. References to fiscal 2016 and 2015 year-to-date relate to the 40 week fiscal periods ended December 5, 2015 and November 29, 2014, respectively.
Use of Estimates	Use of Estimates The preparation of the Company’s 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 The Company considers all highly liquid investments with a maturity of three months or less at the time of purchase to be cash equivalents. The Company’s banking arrangements allow the Company to fund outstanding checks when presented to the financial institution for payment. The Company funds 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.
Inventories, Net	Inventories, Net Inventories are valued at the lower of cost or market. Substantially all of the Company’s inventories consist of finished goods and a substantial portion of the Company’s inventories have a last-in, first-out (“LIFO”) reserve applied. Interim LIFO calculations are based on the Company’s 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.
Revisions	Presentation Revision In the first quarter of fiscal 2016, the Company completed an assessment of its revenue and expense presentation primarily related to professional services and certain other transactions. Expenses related to transactions in which the Company determined it was the principal were previously presented net of related revenues within Net sales in the Condensed Consolidated Statements of Operations. The presentation of these expenses has been revised to include them within Cost of sales and Selling and administrative expenses. These revisions had the effect of increasing Net sales with a corresponding increase to Cost of sales and Selling and administrative expenses. These revisions did not impact Operating earnings, Earnings from continuing operations before income taxes, Net earnings attributable to SUPERVALU INC., cash flows, or financial position for any period reported. These revisions have similarly impacted the Company's financial statements across fiscal periods. Management determined that these revisions are not material to any period reported. Prior period amounts have been revised to conform to the current period presentation as shown below.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In May 2014, the Financial Accounting Standards Board (“FASB”) issued authoritative guidance under accounting standard update (“ASU”) 2014-09, Revenue from Contracts with Customers. ASU 2014-09 supersedes existing revenue recognition requirements and provides a new comprehensive revenue recognition model that requires entities to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. The new authoritative guidance will likely be adopted during the first quarter of fiscal 2019, as permitted by ASU 2015-14. Adoption is allowed by either the full retrospective or modified retrospective approach. The Company is currently evaluating which approach it will apply and the potential adoption impact on its financial statements. In April 2015, the FASB issued ASU 2015-03, Interest - Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs. ASU 2015-03 requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying amount of the related debt obligation. This ASU would apply retrospectively beginning in the first quarter of fiscal 2017, although early adoption is permitted. Debt issuance costs, excluding revolving credit facility financing costs, that the Company would present as a reduction of the related debt included in Other assets were approximately $29 as of December 5, 2015. In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes. ASU 2015-17 requires all deferred income tax assets and liabilities to be classified as non-current in a classified balance sheet. This ASU would first apply prospectively or retrospectively beginning in the first quarter of fiscal 2018, although early adoption is permitted. The Company is currently evaluating which approach it will apply. Current deferred tax liabilities included in Other current liabilities were approximately $12 as of December 5, 2015.

Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.

- Definition

Disclosure of accounting policy for determining an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end is generally noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations are generally also disclosed.

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- Definition

Disclosure of accounting policy for major classes of inventories, bases of stating inventories (for example, lower of cost or market), methods by which amounts are added and removed from inventory classes (for example, FIFO, LIFO, or average cost), loss recognition on impairment of inventories, and situations in which inventories are stated above cost. If inventory is carried at cost, this disclosure includes the nature of the cost elements included in inventory.

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