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Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Nov. 30, 2014		Nov. 30, 2013		Nov. 30, 2014		Nov. 30, 2013
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 3,405,234us-gaap_SalesRevenueNet		$ 2,941,407us-gaap_SalesRevenueNet		$ 10,754,624us-gaap_SalesRevenueNet		$ 9,498,016us-gaap_SalesRevenueNet
Cost of sales	2,958,614us-gaap_CostOfRevenue		2,559,686us-gaap_CostOfRevenue		9,342,934us-gaap_CostOfRevenue		8,233,456us-gaap_CostOfRevenue
GROSS PROFIT	446,620us-gaap_GrossProfit		381,721us-gaap_GrossProfit		1,411,690us-gaap_GrossProfit		1,264,560us-gaap_GrossProfit
CARMAX AUTO FINANCE INCOME	89,722kmx_NetIncomeLossFromFinancing		83,905kmx_NetIncomeLossFromFinancing		276,911kmx_NetIncomeLossFromFinancing		255,346kmx_NetIncomeLossFromFinancing
Selling, general and administrative expenses	316,632us-gaap_SellingGeneralAndAdministrativeExpense		284,366us-gaap_SellingGeneralAndAdministrativeExpense		927,716us-gaap_SellingGeneralAndAdministrativeExpense		857,761us-gaap_SellingGeneralAndAdministrativeExpense
Interest expense	7,338us-gaap_InterestExpense		7,649us-gaap_InterestExpense		22,290us-gaap_InterestExpense		23,288us-gaap_InterestExpense
Other expense	1,536us-gaap_NonoperatingIncomeExpense		411us-gaap_NonoperatingIncomeExpense		2,096us-gaap_NonoperatingIncomeExpense		1,243us-gaap_NonoperatingIncomeExpense
Earnings before income taxes	210,836us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		173,200us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		736,499us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		637,614us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision	80,787us-gaap_IncomeTaxExpenseBenefit		66,748us-gaap_IncomeTaxExpenseBenefit		282,279us-gaap_IncomeTaxExpenseBenefit		244,237us-gaap_IncomeTaxExpenseBenefit
NET EARNINGS	130,049us-gaap_NetIncomeLoss		106,452us-gaap_NetIncomeLoss		454,220us-gaap_NetIncomeLoss		393,377us-gaap_NetIncomeLoss
WEIGHTED AVERAGE COMMON SHARES:
Basic	214,228us-gaap_WeightedAverageNumberOfSharesOutstandingBasic		223,259us-gaap_WeightedAverageNumberOfSharesOutstandingBasic		217,568us-gaap_WeightedAverageNumberOfSharesOutstandingBasic		223,831us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	217,025us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding		227,417us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding		220,585us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding		227,870us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
NET EARNINGS PER SHARE:
Basic	$ 0.61us-gaap_EarningsPerShareBasic		$ 0.48us-gaap_EarningsPerShareBasic		$ 2.09us-gaap_EarningsPerShareBasic		$ 1.76us-gaap_EarningsPerShareBasic
Diluted	$ 0.60us-gaap_EarningsPerShareDiluted		$ 0.47us-gaap_EarningsPerShareDiluted		$ 2.06us-gaap_EarningsPerShareDiluted		$ 1.73us-gaap_EarningsPerShareDiluted
Used Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
Used vehicle sales	2,794,515kmx_UsedVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_UsedVehicleSalesMember		2,396,840kmx_UsedVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_UsedVehicleSalesMember		8,775,021kmx_UsedVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_UsedVehicleSalesMember		7,738,118kmx_UsedVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_UsedVehicleSalesMember
Percentage of Sales
Item as a percent of net sales and operating revenues	82.10%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_UsedVehicleSalesMember	[1]	81.50%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_UsedVehicleSalesMember	[1]	81.60%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_UsedVehicleSalesMember	[1]	81.50%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_UsedVehicleSalesMember	[1]
New Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
New vehicle sales	54,561kmx_NewVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_NewVehicleSalesMember		50,073kmx_NewVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_NewVehicleSalesMember		194,294kmx_NewVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_NewVehicleSalesMember		162,502kmx_NewVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_NewVehicleSalesMember
Percentage of Sales
Item as a percent of net sales and operating revenues	1.60%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NewVehicleSalesMember	[1]	1.70%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NewVehicleSalesMember	[1]	1.80%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NewVehicleSalesMember	[1]	1.70%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NewVehicleSalesMember	[1]
Wholesale Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
Wholesale vehicle sales	481,676kmx_WholesaleVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_WholesaleVehicleSalesMember		437,272kmx_WholesaleVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_WholesaleVehicleSalesMember		1,557,191kmx_WholesaleVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_WholesaleVehicleSalesMember		1,402,838kmx_WholesaleVehicleSalesRevenue / us-gaap_StatementScenarioAxis = kmx_WholesaleVehicleSalesMember
Percentage of Sales
Item as a percent of net sales and operating revenues	14.10%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_WholesaleVehicleSalesMember	[1]	14.90%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_WholesaleVehicleSalesMember	[1]	14.50%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_WholesaleVehicleSalesMember	[1]	14.80%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_WholesaleVehicleSalesMember	[1]
Other Sales And Revenues [Member]
SALES AND OPERATING REVENUES:
Other sales and revenues	$ 74,482us-gaap_OtherSalesRevenueNet / us-gaap_StatementScenarioAxis = kmx_OtherSalesAndRevenuesMember		$ 57,222us-gaap_OtherSalesRevenueNet / us-gaap_StatementScenarioAxis = kmx_OtherSalesAndRevenuesMember		$ 228,118us-gaap_OtherSalesRevenueNet / us-gaap_StatementScenarioAxis = kmx_OtherSalesAndRevenuesMember		$ 194,558us-gaap_OtherSalesRevenueNet / us-gaap_StatementScenarioAxis = kmx_OtherSalesAndRevenuesMember
Percentage of Sales
Item as a percent of net sales and operating revenues	2.20%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_OtherSalesAndRevenuesMember	[1]	1.90%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_OtherSalesAndRevenuesMember	[1]	2.10%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_OtherSalesAndRevenuesMember	[1]	2.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_OtherSalesAndRevenuesMember	[1]
Net Sales And Operating Revenues [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	100.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetSalesAndOperatingRevenuesMember	[1]	100.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetSalesAndOperatingRevenuesMember	[1]	100.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetSalesAndOperatingRevenuesMember	[1]	100.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetSalesAndOperatingRevenuesMember	[1]
Cost Of Sales [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	86.90%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_CostOfSalesMember	[1]	87.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_CostOfSalesMember	[1]	86.90%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_CostOfSalesMember	[1]	86.70%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_CostOfSalesMember	[1]
Gross Profit [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	13.10%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_GrossProfitMember	[1]	13.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_GrossProfitMember	[1]	13.10%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_GrossProfitMember	[1]	13.30%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_GrossProfitMember	[1]
CAF Income [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	2.60%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetIncomeLossFromFinancingMember	[1]	2.90%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetIncomeLossFromFinancingMember	[1]	2.60%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetIncomeLossFromFinancingMember	[1]	2.70%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetIncomeLossFromFinancingMember	[1]
Selling, General And Administrative Expenses [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	9.30%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	[1]	9.70%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	[1]	8.60%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	[1]	9.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	[1]
Interest Expense [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	0.20%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_InterestExpenseMember	[1]	0.30%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_InterestExpenseMember	[1]	0.20%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_InterestExpenseMember	[1]	0.20%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_InterestExpenseMember	[1]
Other Loss Income [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	0.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_NonoperatingIncomeExpenseMember	[1]	0.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_NonoperatingIncomeExpenseMember	[1]	0.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_NonoperatingIncomeExpenseMember	[1]	0.00%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = us-gaap_NonoperatingIncomeExpenseMember	[1]
Earnings Before Income Taxes [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	6.20%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_EarningsBeforeIncomeTaxesMember	[1]	5.90%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_EarningsBeforeIncomeTaxesMember	[1]	6.80%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_EarningsBeforeIncomeTaxesMember	[1]	6.70%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_EarningsBeforeIncomeTaxesMember	[1]
Income Tax Provision [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	2.40%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_IncomeTaxProvisionMember	[1]	2.30%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_IncomeTaxProvisionMember	[1]	2.60%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_IncomeTaxProvisionMember	[1]	2.60%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_IncomeTaxProvisionMember	[1]
Net Earnings [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	3.80%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetEarningsMember	[1]	3.60%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetEarningsMember	[1]	4.20%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetEarningsMember	[1]	4.10%kmx_ItemAsPercentOfNetSalesAndOperatingRevenues / us-gaap_StatementScenarioAxis = kmx_NetEarningsMember	[1]
[1] Calculated as a percentage of net sales and operating revenues and may not equal totals due to rounding.

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