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Supplemental Cash Flow Information Supplemental Cash Flow Information - USD ($) $ in Thousands	9 Months Ended
	Nov. 30, 2025	Nov. 30, 2024
Supplemental Cash Flow Elements [Abstract]
Increase in accrued capital expenditures	$ 6,037	$ 11,023
Increase (decrease) in financing obligations	11,273	(2,360)
Auto loans sold in exchange for beneficial interests	48,556	0
Increase (Decrease) in Receivable for Investment Sold	$ 0	$ 12,312

X

- Definition

Auto loans sold in exchange for beneficial interests

+ References

No definition available.

+ Details

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Namespace Prefix:	kmx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

X

- 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

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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase (decrease) in receivable from sale of investment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 230
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477867/946-230-45-1

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- References

No definition available.

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