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Auto Loan Receivables (Allowance For Loan Losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Nov. 30, 2014		Nov. 30, 2013		Nov. 30, 2014		Nov. 30, 2013		Aug. 31, 2014		Feb. 28, 2014		Aug. 31, 2013		Feb. 28, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance as of beginning of period	$ 77.8us-gaap_FinancingReceivableAllowanceForCreditLosses		$ 65.9us-gaap_FinancingReceivableAllowanceForCreditLosses		$ 69.9us-gaap_FinancingReceivableAllowanceForCreditLosses		$ 57.3us-gaap_FinancingReceivableAllowanceForCreditLosses
Charge-offs	(43.8)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs		(36.3)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs		(112.7)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs		(94.5)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Recoveries	22.3us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery		18.6us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery		62.9us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery		56.1us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Provision for loan losses	(24.1)us-gaap_ProvisionForLoanLeaseAndOtherLosses		(19.7)us-gaap_ProvisionForLoanLeaseAndOtherLosses		(60.3)us-gaap_ProvisionForLoanLeaseAndOtherLosses		(49.0)us-gaap_ProvisionForLoanLeaseAndOtherLosses
Balance as of end of period	$ 80.4us-gaap_FinancingReceivableAllowanceForCreditLosses		$ 67.9us-gaap_FinancingReceivableAllowanceForCreditLosses		$ 80.4us-gaap_FinancingReceivableAllowanceForCreditLosses		$ 67.9us-gaap_FinancingReceivableAllowanceForCreditLosses
Allowance For Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Item as percent of total ending managed receivables	0.98%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	[1]	0.98%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	[1]	0.98%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	[1]	0.98%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	[1]	0.99%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	[1]	0.97%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	[1]	0.99%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	[1]	0.97%kmx_ItemAsPercentOfTotalEndingManagedReceivables / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLoanAndLeaseLossesMember	[1]
[1] (1)Percentage of total ending managed receivables as of the corresponding reporting date.

X

- Definition

Item as percent of total ending managed receivables

+ References

No definition available.

+ Details

Name:	kmx_ItemAsPercentOfTotalEndingManagedReceivables
Namespace Prefix:	kmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(4)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.11)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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