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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
	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	$ 19,685us-gaap_AllocatedShareBasedCompensationExpense	$ 17,198us-gaap_AllocatedShareBasedCompensationExpense	$ 58,105us-gaap_AllocatedShareBasedCompensationExpense	$ 55,806us-gaap_AllocatedShareBasedCompensationExpense
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense, before income taxes	6,223us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	5,946us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	21,230us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	18,765us-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	10,121us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_CashSettledRestrictedStockUnitsMember	8,014us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_CashSettledRestrictedStockUnitsMember	24,342us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_CashSettledRestrictedStockUnitsMember	25,986us-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	3,004us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockSettledRestrictedStockUnitsMember	2,986us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockSettledRestrictedStockUnitsMember	10,597us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockSettledRestrictedStockUnitsMember	9,697us-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	271us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember	252us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember	913us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember	858us-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	66us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	1,023us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	0us-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	$ 0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockGrantsToNonEmployeeDirectorsMember	$ 0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockGrantsToNonEmployeeDirectorsMember	$ 0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockGrantsToNonEmployeeDirectorsMember	$ 500us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = kmx_StockGrantsToNonEmployeeDirectorsMember

X

- 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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