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v3.21.4

Leases Narrative (Details) | 9 Months Ended
--- | ---
Nov. 30, 2021
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

X
- 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

X
- 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

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

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

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