XML 109 R88.htm IDEA: XBRL DOCUMENT v3.21.1

Leases (Narrative) (Details)	12 Months Ended
	Feb. 28, 2021
Minimum
Lessee, Lease, Description [Line Items]
Lease renewal term, years	1 year
Real Estate Lease Term	5 years
Equipment Lease Term	3 years
Maximum
Lessee, Lease, Description [Line Items]
Lease renewal term, years	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: