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Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Nov. 30, 2014
Schedule of Accumulated Other Comprehensive Loss [Line Items]  
Balance $ (46,271)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income before reclassifications (4,001)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
Amounts reclassified from accumulated other comprehensive loss 4,414us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Other comprehensive income (loss) 413us-gaap_OtherComprehensiveIncomeLossNetOfTax
Balance (45,858)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Net Unrecognized Actuarial Losses [Member]  
Schedule of Accumulated Other Comprehensive Loss [Line Items]  
Balance (38,715)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= kmx_UnrecognizedActuarialLossesMember
Other comprehensive income before reclassifications 0us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= kmx_UnrecognizedActuarialLossesMember
Amounts reclassified from accumulated other comprehensive loss 640us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= kmx_UnrecognizedActuarialLossesMember
Other comprehensive income (loss) 640us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= kmx_UnrecognizedActuarialLossesMember
Balance (38,075)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= kmx_UnrecognizedActuarialLossesMember
Net Unrecognized Hedge Losses [Member]  
Schedule of Accumulated Other Comprehensive Loss [Line Items]  
Balance (7,556)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= kmx_UnrecognizedHedgeLossesMember
Other comprehensive income before reclassifications (4,001)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= kmx_UnrecognizedHedgeLossesMember
Amounts reclassified from accumulated other comprehensive loss 3,774us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= kmx_UnrecognizedHedgeLossesMember
Other comprehensive income (loss) (227)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= kmx_UnrecognizedHedgeLossesMember
Balance $ (7,783)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= kmx_UnrecognizedHedgeLossesMember