Basis of Presentation	3 Months Ended
Basis of Presentation	May 05, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Unless the context otherwise requires, the use of the terms “Best Buy,” “we,” “us” and “our” in these Notes to Condensed Consolidated Financial Statements refers to Best Buy Co., Inc. and its consolidated subsidiaries. In the opinion of management, the accompanying condensed consolidated financial statements contain all adjustments necessary for a fair presentation as prescribed by accounting principles generally accepted in the United States (“GAAP”). All adjustments were comprised of normal recurring adjustments, except as noted in these Notes to Condensed Consolidated Financial Statements. Historically, we have realized more of our revenue and earnings in the fiscal fourth quarter, which includes the majority of the holiday shopping season in the U.S., Europe and Canada, than in any other fiscal quarter. Due to the seasonal nature of our business, interim results are not necessarily indicative of results for the entire fiscal year. The interim financial statements and the related notes in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and related notes included in our Annual Report on Form 10-K for the fiscal year ended March 3, 2012. Beginning in the first quarter of fiscal 2013, we changed our fiscal year-end. As a result of the change in our fiscal year-end, the comparable prior year financial statements have been recast to conform to the new fiscal calendar. The first quarter of fiscal 2013 included 14 weeks and the recast first quarter of 2012 included 13 weeks. See Note 2, Fiscal Year-end Change, for further information. In order to align our fiscal reporting periods and comply with statutory filing requirements in certain foreign jurisdictions, we consolidate the financial results of our Europe, China and Mexico operations ("lag entities") on a one-month lag. Our policy is to accelerate recording the effect of events occurring in the lag period that significantly affect our consolidated financial statements. There were no significant intervening events which would have materially affected our financial condition, results of operations or liquidity had they been recorded during the three months ended May 5, 2012. In preparing the accompanying condensed consolidated financial statements, we evaluated the period from May 6, 2012, through the date the financial statements were issued for material subsequent events requiring recognition or disclosure. No such events were identified for this period. New Accounting Standards Goodwill Impairment — In September 2011, the Financial Accounting Standards Board (“FASB”) issued new guidance on the testing of goodwill for impairment. Under the new guidance, entities may make a qualitative assessment of the likelihood of goodwill impairment in order to determine whether a detailed quantitative analysis is required. This new guidance is effective for fiscal years and interim periods beginning after December 15, 2011. As such, we adopted the new guidance on March 4, 2012, and determined that it did not have an impact on our consolidated financial position, results of operations or cash flows. Comprehensive Income — In June 2011, the FASB issued new guidance on the presentation of comprehensive income. Specifically, the new guidance requires an entity to present components of net income and other comprehensive income in one continuous statement, referred to as the statement of comprehensive income, or in two separate, but consecutive statements. The new guidance eliminated the previous option to report other comprehensive income and its components in the statement of changes in equity. While the new guidance changed the presentation of comprehensive income, there are no changes to the components that are recognized in net income or other comprehensive income under current accounting guidance. This new guidance is effective for fiscal years and interim periods beginning after December 15, 2011. As such, we adopted the new guidance on March 4, 2012, and have presented total comprehensive income in our Condensed Consolidated Statements of Earnings and Comprehensive Income. Fair Value Measurement — In April 2011, the FASB issued new guidance to converge fair value measurement and disclosure guidance with International Financial Reporting Standards. This new guidance amended current fair value measurement and disclosure guidance to include increased transparency around valuation inputs and investment categorization. This new guidance is effective for fiscal years and interim periods beginning after December 15, 2011. As such, we adopted the new guidance on March 4, 2012, and determined that it did not have an impact on our consolidated financial position, results of operations or cash flows.

The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

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