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v2.4.1.9

Debt (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2014 | Nov. 30, 2014 | Feb. 28, 2014 | Nov. 25, 2014 | Jul. 02, 2014
Debt Instrument [Line Items] |  |  |  |  |
Non-recourse notes payable | $ 8,180,000,000 us-gaap_NonRecourseDebt | $ 8,180,000,000 us-gaap_NonRecourseDebt | $ 7,250,000,000 us-gaap_NonRecourseDebt |  |
Other Long-term Debt, Noncurrent | 300,000,000 us-gaap_OtherLongTermDebtNoncurrent | 300,000,000 us-gaap_OtherLongTermDebtNoncurrent | 0 us-gaap_OtherLongTermDebtNoncurrent |  |
Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity of revolving credit facility | 1,000,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 1,000,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |
Revolving credit facility, expiration date |  | Aug. 01, 2016 |  |  |
Revolving Credit Facility, Remaining Borrowing Capacity | 997,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 997,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |
Revolving Credit Facility, Increase (Decrease) | 300,000,000 us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |
Warehouse Facilities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Non-recourse notes payable | 959,000,000 us-gaap_NonRecourseDebt / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember | 959,000,000 us-gaap_NonRecourseDebt / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember |  |  |
Warehouse facilities maximum borrowing capacity | 2,300,000,000 kmx_WarehouseFacilitiesMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember | 2,300,000,000 kmx_WarehouseFacilitiesMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember |  |  |
Remaining borrowing capacity | 1,340,000,000 kmx_WarehouseFacilitiesRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember | 1,340,000,000 kmx_WarehouseFacilitiesRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember |  |  |
Term Securitizations Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt maturity, end |  | May 01, 2021 |  |  |
Non-recourse notes payable | 7,220,000,000 us-gaap_NonRecourseDebt / us-gaap_DebtInstrumentAxis = kmx_TermSecuritizationsDebtMember | 7,220,000,000 us-gaap_NonRecourseDebt / us-gaap_DebtInstrumentAxis = kmx_TermSecuritizationsDebtMember |  |  |
Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term Loan expiraton date |  | Nov. 01, 2017 |  |  |
Warehouse Facility One [Member] | Warehouse Facilities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Warehouse facilities maximum borrowing capacity | 800,000,000 kmx_WarehouseFacilitiesMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember / us-gaap_LineOfCreditFacilityAxis = kmx_WarehouseFacilityOneMember | 800,000,000 kmx_WarehouseFacilitiesMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember / us-gaap_LineOfCreditFacilityAxis = kmx_WarehouseFacilityOneMember |  |  |
Warehouse facility expiration date | Jul. 01, 2015 |  |  |  |
Warehouse facility additional term of facility, days |  | 364 days |  |  |
Warehouse Facility Two [Member] | Warehouse Facilities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Warehouse Facility Additional Limit |  |  |  | 200,000,000 kmx_WarehouseFacilityAdditionalLimit / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember / us-gaap_LineOfCreditFacilityAxis = kmx_WarehouseFacilityTwoMember | 300,000,000 kmx_WarehouseFacilityAdditionalLimit / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember / us-gaap_LineOfCreditFacilityAxis = kmx_WarehouseFacilityTwoMember
Warehouse facilities maximum borrowing capacity | 1,500,000,000 kmx_WarehouseFacilitiesMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember / us-gaap_LineOfCreditFacilityAxis = kmx_WarehouseFacilityTwoMember | 1,500,000,000 kmx_WarehouseFacilitiesMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember / us-gaap_LineOfCreditFacilityAxis = kmx_WarehouseFacilityTwoMember |  |  |
Warehouse facility expiration date |  | Feb. 01, 2015 |  |  |
Previously Reported [Member] | Warehouse Facility One [Member] | Warehouse Facilities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Warehouse facilities maximum borrowing capacity | $ 800,000,000 kmx_WarehouseFacilitiesMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember / us-gaap_LineOfCreditFacilityAxis = kmx_WarehouseFacilityOneMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 800,000,000 kmx_WarehouseFacilitiesMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = kmx_WarehouseFacilitiesMember / us-gaap_LineOfCreditFacilityAxis = kmx_WarehouseFacilityOneMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |
Minimum [Member] | Finance And Capital Lease Obligation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Initial lease terms, in years |  | 15 years |  |  |
Maximum [Member] | Finance And Capital Lease Obligation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Initial lease terms, in years |  | 20 years |  |  |

X
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- 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
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