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Stock And Stock-Based Incentive Plans (Expected Cash Settlement Range Upon Restricted Stock Unit Vesting) (Details) (USD $) In Thousands, unless otherwise specified | Nov. 30, 2014
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Minimum [Member] |  |
Fiscal 2016 | $ 12,307 kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInNextFiscalYear / us-gaap_RangeAxis = us-gaap_MinimumMember | [1]
Fiscal 2017 | 14,028 kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInTwoYears / us-gaap_RangeAxis = us-gaap_MinimumMember | [1]
Fiscal 2018 | 16,225 kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInThreeYears / us-gaap_RangeAxis = us-gaap_MinimumMember | [1]
Total expected cash settlements | 42,560 kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVesting / us-gaap_RangeAxis = us-gaap_MinimumMember | [1]
Maximum [Member] |  |
Fiscal 2016 | 32,820 kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInNextFiscalYear / us-gaap_RangeAxis = us-gaap_MaximumMember | [1]
Fiscal 2017 | 37,408 kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInTwoYears / us-gaap_RangeAxis = us-gaap_MaximumMember | [1]
Fiscal 2018 | 43,266 kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInThreeYears / us-gaap_RangeAxis = us-gaap_MaximumMember | [1]
Total expected cash settlements | $ 113,494 kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVesting / us-gaap_RangeAxis = us-gaap_MaximumMember | [1]
[1] | As of November 30, 2014(In thousands)Minimum (1)Maximum (1)Fiscal 2016$ 12,307$ 32,820Fiscal 2017 14,028 37,408Fiscal 2018 16,225 43,266Total expected cash settlements$ 42,560$ 113,494 (1)Net of estimated forfeitures.

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected Cash Payouts Upon Vesting + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected Cash Payouts Upon Vesting In Next Fiscal Year + References No definition available. + Details
Name: | kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInNextFiscalYear
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected Cash Payouts Upon Vesting In Three Years + References No definition available. + Details
Name: | kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInThreeYears
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected Cash Payouts Upon Vesting In Two Years + References No definition available. + Details
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Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
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Data Type: | na
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Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
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Data Type: | na
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