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v3.24.3

Leases Narrative (Details) | 6 Months Ended
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Aug. 31, 2024
Minimum |
Lessee, Lease, Description [Line Items] |
Lease renewal term | 1 year
Real Estate Lease Term | 5 years
Equipment Lease Term | 3 years
Maximum |
Lessee, Lease, Description [Line Items] |
Lease renewal term | 20 years
Real Estate Lease Term | 20 years
Equipment Lease Term | 8 years

X
- Definition Equipment Lease Term + References No definition available. + Details
Name: | kmx_EquipmentLeaseTerm
Namespace Prefix: | kmx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease renewal term + References No definition available. + Details
Name: | kmx_LeaseRenewalTerm
Namespace Prefix: | kmx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Real Estate Lease Term + References No definition available. + Details
Name: | kmx_RealEstateLeaseTerm
Namespace Prefix: | kmx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |