XML 51 R37.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Auto Loan Receivables Auto Loan Receivables (Narrative) (Details) $ in Millions | Nov. 30, 2016 USD ($)
--- | ---
Warehouse Facility Three [Member] |
Debt Instrument [Line Items] |
Warehouse Facilities Maximum Borrowing Capacity | $ 100

X
- Definition Maximum borrowing capacity under all warehouse facilities without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facilities. + References No definition available. + Details
Name: | kmx_WarehouseFacilitiesMaximumBorrowingCapacity
Namespace Prefix: | kmx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=kmx_WarehouseFacilityThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |