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Accounting Policies (Policy)
9 Months Ended
Nov. 30, 2011
Accounting Policies [Abstract]  
Basis Of Presentation And Use Of Estimates

Basis of Presentation and Use of Estimates. The accompanying interim unaudited consolidated financial statements include the accounts of CarMax and our wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. These consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles ("GAAP") for interim financial information. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, such interim consolidated financial statements reflect all normal recurring adjustments considered necessary to present fairly the financial position and the results of operations and cash flows for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full fiscal year. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and footnotes included in our Annual Report on Form 10-K for the fiscal year ended February 28, 2011.

Use Of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. Certain prior year amounts have been reclassified to conform to the current year's presentation. Amounts and percentages may not total due to rounding.

Cash And Cash Equivalents

Cash and Cash Equivalents. Cash equivalents of $372.2 million as of November 30, 2011, and $23.9 million as of February 28, 2011, consisted of highly liquid investments with original maturities of three months or less.

Restricted Cash From Collections On Auto Loan Receivables
Securitizations

Securitizations. As of March 1, 2010, we adopted Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") Nos. 2009-16 and 2009-17 (formerly Statements of Financial Accounting Standards Nos. 166 and 167, respectively) with prospective application. ASU No. 2009-16 amended FASB Accounting Standards Codification ("ASC") Topic 860, "Transfers and Servicing," and ASU No. 2009-17 amended FASB ASC Topic 810, "Consolidation." ASU No. 2009-16 removed the concept of a qualifying special-purpose entity ("QSPE") from Topic 860 and removed the provision within Topic 810 exempting these entities from consolidation. These pronouncements also clarified the requirements for isolation and the limitations on the portions of financial assets that are eligible for sale accounting treatment.

Effective March 1, 2010, we recognize transfers of auto loan receivables into term securitizations as secured borrowings, which results in recording the auto loan receivables and the related non-recourse notes payable to the investors on our consolidated balance sheets. All transfers of receivables into our warehouse facilities on or after March 1, 2010, are also accounted for as secured borrowings. As of March 1, 2010, we amended our warehouse facility agreement in effect as of that date. As a result, auto loan receivables previously securitized through that warehouse facility no longer qualify for sale treatment because, under the amendment, CarMax now has effective control over the receivables. The receivables that were funded in the warehouse facility at that date were consolidated, at their fair value, along with the related non-recourse notes payable to the investors.

Beginning in fiscal 2011, CAF income no longer includes a gain on the sale of loans through securitization transactions, but instead primarily reflects the interest and fee income generated by the auto loan receivables less the interest expense associated with the non-recourse notes payable issued to fund these receivables, direct CAF expenses and a provision for estimated loan losses. See Notes 3 and 5 for additional information on securitizations.

Auto Loan Receivables, Net

Auto Loan Receivables, Net. Auto loan receivables include amounts due from customers primarily related to used retail vehicle sales financed through CAF and are presented net of an allowance for estimated loan losses. The allowance for loan losses represents an estimate of the amount of net losses inherent in our portfolio of managed receivables as of the applicable reporting date and anticipated to occur during the following 12 months. The allowance is primarily based on the credit quality of the underlying receivables, historical loss trends and forecasted forward loss curves. We also take into account recent trends in delinquencies and losses, recovery rates and the economic environment. The provision for loan losses is the periodic expense of maintaining an adequate allowance.

An account is considered delinquent when the related customer fails to make a substantial portion of a scheduled payment on or before the due date. In general, accounts are charged-off on the last business day of the month during which the earliest of the following occurs: the receivable is 120 days or more delinquent as of the last business day of the month, the related vehicle is repossessed and liquidated or the receivable is otherwise deemed uncollectible. For purposes of determining impairment, auto loans are evaluated collectively, as they represent a large group of smaller-balance homogeneous loans, and therefore, are not individually evaluated for impairment. See Note 4 for additional information on auto loan receivables.

Interest income and expenses related to auto loans are included in CAF income. Interest income on auto loan receivables is recognized when earned based on contractual loan terms. All loans continue to accrue interest until repayment or charge-off. Direct costs associated with loan originations are not considered material. See Note 3 for a summary of CAF income.

Derivative Instruments And Hedging Activities

Derivative Instruments and Hedging Activities. We enter into derivative instruments to manage exposures that arise from business activities that result in the future known receipt or payment of uncertain cash amounts, the values of which are impacted by interest rates. We recognize the derivatives at fair value as either current assets or current liabilities on the consolidated balance sheets. Where applicable, such contracts covered by master netting agreements are reported net. Gross positive fair values are netted with gross negative fair values by counterparty. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. We may enter into derivative contracts that are intended to economically hedge certain risks, even though hedge accounting may not apply or we do not elect to apply hedge accounting. See Note 6 for additional information on derivative instruments and hedging activities.

Other Assets