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Stock And Stock-Based Incentive Plans (Composition Of Share-Based Compensation Expense - By Grant Type) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2014 | Nov. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense, before income taxes | $ 19,685 us-gaap_AllocatedShareBasedCompensationExpense | $ 17,198 us-gaap_AllocatedShareBasedCompensationExpense | $ 58,105 us-gaap_AllocatedShareBasedCompensationExpense | $ 55,806 us-gaap_AllocatedShareBasedCompensationExpense
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense, before income taxes | 6,223 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 5,946 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 21,230 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 18,765 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Cash-Settled Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense, before income taxes | 10,121 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_CashSettledRestrictedStockUnitsMember | 8,014 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_CashSettledRestrictedStockUnitsMember | 24,342 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_CashSettledRestrictedStockUnitsMember | 25,986 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_CashSettledRestrictedStockUnitsMember
Stock-Settled Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense, before income taxes | 3,004 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockSettledRestrictedStockUnitsMember | 2,986 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockSettledRestrictedStockUnitsMember | 10,597 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockSettledRestrictedStockUnitsMember | 9,697 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockSettledRestrictedStockUnitsMember
Employee Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense, before income taxes | 271 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember | 252 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember | 913 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember | 858 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember
Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense, before income taxes | 66 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 1,023 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Stock Grants To Non-Employee Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense, before income taxes | $ 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockGrantsToNonEmployeeDirectorsMember | $ 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockGrantsToNonEmployeeDirectorsMember | $ 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockGrantsToNonEmployeeDirectorsMember | $ 500 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockGrantsToNonEmployeeDirectorsMember

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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