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Supplemental Cash Flow Information Supplemental Cash Flow Information - USD ($) $ in Thousands | 6 Months Ended
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Aug. 31, 2024 | Aug. 31, 2023
Supplemental Cash Flow Elements [Abstract] |  |
Increase (decrease) in accrued capital expenditures | $ 816 | $ 18,607
Increase in financing obligations | $ 0 | $ 4,527

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- Definition The increase/decrease during the period in financing obligations due to entering into or modifying existing lease-related financing obligations. + References No definition available. + Details
Name: | kmx_FinancingObligationsIncurred
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration