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Cancellation Reserves (Narrative) (Details) - USD ($) $ in Millions	May 31, 2018	Feb. 28, 2018
Cancellation Reserves [Abstract]
Cancellation reserves, current portion	$ 57.5	$ 56.0

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- Definition

Total of current allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Contract Cancellation Reserves [Abstract]

+ References

No definition available.

+ Details

Name:	kmx_ContractCancellationReservesAbstract
Namespace Prefix:	kmx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration