$KMX
CARMAX INC Stock $kmx

$kmx Overview Financials Valuation SEC Filings Company Website

2020 Q1 Form 10-K Financial Statement

#000117001020000033 Filed on April 21, 2020

Income Statement

Concept	2020 Q1	2019 Q1	2018 Q4
Revenue	$4.962B	$4.319B	$4.296B
YoY Change	14.91%	5.74%	4.6%
Cost Of Revenue	$4.290B	$3.719B	$3.727B
YoY Change	15.34%	4.84%	4.45%
Gross Profit	$672.9M	$599.4M	$569.2M
YoY Change	12.26%	11.67%	5.57%
Gross Profit Margin	13.56%	13.88%	13.25%
Selling, General & Admin	$484.7M	$429.0M	$409.5M
YoY Change	13.0%	4.93%	2.46%
% of Gross Profit	72.04%	71.57%	71.94%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$57.60M	$46.60M	$45.30M
YoY Change	23.61%	-0.21%	0.44%
% of Gross Profit	8.56%	7.77%	7.96%
Operating Expenses	$484.7M	$429.0M	$409.5M
YoY Change	13.0%	4.93%	2.46%
Operating Profit	$188.1M	$170.4M	$159.7M
YoY Change	10.4%	33.22%	14.48%
Interest Expense	$89.60M	$82.70M	$18.81M
YoY Change	8.34%	1.6%	8.1%
% of Operating Profit	47.63%	48.53%	11.78%
Other Income/Expense, Net			-$2.820M
YoY Change			-1110.75%
Pretax Income	$276.6M	$255.8M	$247.8M
YoY Change	8.13%	21.75%	10.04%
Income Tax	$61.70M	$63.30M	$57.50M
% Of Pretax Income	22.31%	24.75%	23.2%
Net Earnings	$214.9M	$192.6M	$190.3M
YoY Change	11.62%	57.64%	27.86%
Net Earnings / Revenue	4.33%	4.46%	4.43%
Basic Earnings Per Share	$1.32	$1.14	$1.09
Diluted Earnings Per Share	$1.30	$1.13	$1.09
COMMON SHARES
Basic Shares Outstanding	162.6M shares	166.2M shares	173.8M shares
Diluted Shares Outstanding			175.3M shares

Balance Sheet

Concept	2020 Q1	2019 Q1	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$58.00M	$47.00M	$35.00M
YoY Change	23.4%	4.44%	34.62%
Cash & Equivalents	$58.21M	$46.94M	$35.05M
Short-Term Investments
Other Short-Term Assets	$86.93M	$67.10M	$59.90M
YoY Change	29.55%	-28.21%	12.39%
Inventory	$2.846B	$2.519B	$2.425B
Prepaid Expenses
Receivables	$191.1M	$139.9M	$111.2M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$3.664B	$3.214B	$3.057B
YoY Change	13.99%	4.98%	1.75%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.069B	$2.828B	$2.800B
YoY Change	8.52%	6.04%	6.29%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$258.7M	$186.0M	$182.2M
YoY Change	39.14%	17.1%	18.26%
Total Long-Term Assets	$17.42B	$15.50B	$15.34B
YoY Change	12.35%	7.48%	7.28%
TOTAL ASSETS
Total Short-Term Assets	$3.664B	$3.214B	$3.057B
Total Long-Term Assets	$17.42B	$15.50B	$15.34B
Total Assets	$21.08B	$18.72B	$18.40B
YoY Change	12.63%	7.04%	6.32%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$737.1M	$593.2M	$558.3M
YoY Change	24.27%	11.98%	7.37%
Accrued Expenses	$331.7M	$318.2M	$280.1M
YoY Change	4.25%	14.15%	20.01%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$1.000M	$0.00
YoY Change	-100.0%		-100.0%
Long-Term Debt Due	$9.251M	$10.18M	$384.0M
YoY Change	-9.1%	-97.21%	7.26%
Total Short-Term Liabilities	$1.535B	$1.312B	$1.225B
YoY Change	17.02%	11.71%	10.18%
LONG-TERM LIABILITIES
Long-Term Debt	$15.02B	$13.78B	$13.49B
YoY Change	9.04%	8.03%	6.66%
Other Long-Term Liabilities	$393.9M	$272.8M	$242.6M
YoY Change	44.38%	12.47%	1.24%
Total Long-Term Liabilities	$393.9M	$272.8M	$242.6M
YoY Change	44.38%	12.47%	1.24%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.535B	$1.312B	$1.225B
Total Long-Term Liabilities	$393.9M	$272.8M	$242.6M
Total Liabilities	$17.31B	$15.36B	$14.96B
YoY Change	12.71%	8.41%	6.85%
SHAREHOLDERS EQUITY
Retained Earnings	$2.488B	$2.104B	$2.147B
YoY Change	18.26%	2.78%	5.88%
Common Stock	$81.54M	$83.74M	$85.89M
YoY Change	-2.62%	-6.83%	-5.35%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.769B	$3.357B	$3.435B
YoY Change
Total Liabilities & Shareholders Equity	$21.08B	$18.72B	$18.40B
YoY Change	12.63%	7.04%	6.32%

Cashflow Statement

Concept	2020 Q1	2019 Q1	2018 Q4
OPERATING ACTIVITIES
Net Income	$214.9M	$192.6M	$190.3M
YoY Change	11.62%	57.64%	27.86%
Depreciation, Depletion And Amortization	$57.60M	$46.60M	$45.30M
YoY Change	23.61%	-0.21%	0.44%
Cash From Operating Activities	-$118.7M	$48.40M	$3.700M
YoY Change	-345.25%	-56.98%	-101.35%
INVESTING ACTIVITIES
Capital Expenditures	-$82.70M	-$61.30M	-$72.20M
YoY Change	34.91%	-11.42%	-0.41%
Acquisitions
YoY Change
Other Investing Activities	-$50.10M	-$200.0K	$100.0K
YoY Change	24950.0%	-118.18%	-101.92%
Cash From Investing Activities	-$132.8M	-$61.50M	-$72.10M
YoY Change	115.93%	-9.96%	-7.09%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	277.9M	39.20M	38.50M
YoY Change	608.93%	-359.6%	-88.58%
NET CHANGE
Cash From Operating Activities	-118.7M	48.40M	3.700M
Cash From Investing Activities	-132.8M	-61.50M	-72.10M
Cash From Financing Activities	277.9M	39.20M	38.50M
Net Change In Cash	26.40M	26.10M	-29.90M
YoY Change	1.15%	-10.31%	104.79%
FREE CASH FLOW
Cash From Operating Activities	-$118.7M	$48.40M	$3.700M
Capital Expenditures	-$82.70M	-$61.30M	-$72.20M
Free Cash Flow	-$36.00M	$109.7M	$75.90M
YoY Change	-132.82%	-39.63%	-137.63%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--02-29
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001170010
CY2019Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.5
CY2020Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.5
CY2019Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	350000000	shares
CY2020Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	350000000	shares
CY2019Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	167478924	shares
CY2020Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	163081376	shares
CY2019Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	167478924	shares
CY2020Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	163081376	shares
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-02-29
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-31420
CY2020	dei	Entity Registrant Name EntityRegistrantName	CARMAX, INC.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	VA
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	54-1821055
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	12800 Tuckahoe Creek Parkway
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Richmond,
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	VA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	23238
CY2020	dei	City Area Code CityAreaCode	804
CY2020	dei	Local Phone Number LocalPhoneNumber	747-0422
CY2020	dei	Security12b Title Security12bTitle	Common Stock
CY2020	dei	Trading Symbol TradingSymbol	KMX
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2019Q3	dei	Entity Public Float EntityPublicFloat	13731676765	USD
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	162574714	shares
CY2019Q1	us-gaap	Accounts Payable Current AccountsPayableCurrent	593171000	USD
CY2020Q1	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	331738000	USD
CY2020	us-gaap	Revenues Revenues	20319987000	USD
CY2019	us-gaap	Revenues Revenues	18173100000	USD
CY2018	us-gaap	Revenues Revenues	17120209000	USD
CY2020	us-gaap	Cost Of Revenue CostOfRevenue	17597647000	USD
CY2019	us-gaap	Cost Of Revenue CostOfRevenue	15692509000	USD
CY2018	us-gaap	Cost Of Revenue CostOfRevenue	14791350000	USD
CY2020	us-gaap	Gross Profit GrossProfit	2722340000	USD
CY2019	us-gaap	Gross Profit GrossProfit	2480591000	USD
CY2018	us-gaap	Gross Profit GrossProfit	2328859000	USD
CY2020	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	456030000	USD
CY2019	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	438690000	USD
CY2018	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	421182000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1940067000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1730275000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1617051000	USD
CY2020	us-gaap	Interest Expense InterestExpense	83007000	USD
CY2019	us-gaap	Interest Expense InterestExpense	75792000	USD
CY2018	us-gaap	Interest Expense InterestExpense	70745000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	5690000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-408000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	1363000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1160986000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1112806000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1063608000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	272553000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	270393000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	399496000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	888433000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	842413000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	664112000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	164836000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	174463000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	182660000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	166820000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	175884000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	184470000	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.39
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.83
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CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.33
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CY2020Q1	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	1389000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	888433000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	842413000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	664112000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	50824000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	1981000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	1371000	USD
CY2020	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-31237000	USD
CY2019	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-11717000	USD
CY2018	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	14194000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-82061000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-13698000	USD
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CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	828715000	USD
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CY2020Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	58211000	USD
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CY2020Q1	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	481043000	USD
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CY2020Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3768875000	USD
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CY2018	us-gaap	Net Income Loss NetIncomeLoss	664112000	USD
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CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	179942000	USD
CY2020	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	59050000	USD
CY2019	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	6147000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	153848000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	137591000	USD
CY2020	kmx	Provision For Contract Cancellation Reserves ProvisionForContractCancellationReserves	89272000	USD
CY2019	kmx	Provision For Contract Cancellation Reserves ProvisionForContractCancellationReserves	63937000	USD
CY2018	kmx	Provision For Contract Cancellation Reserves ProvisionForContractCancellationReserves	62749000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1102000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2300000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	81007000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-3507000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-2825000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-1298000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	51240000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	6529000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-19067000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	326961000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	128761000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	130131000	USD
CY2020	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	19843000	USD
CY2019	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-32890000	USD
CY2018	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	34620000	USD
CY2020	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	1308919000	USD
CY2019	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	1046631000	USD
CY2018	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	1077219000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	-4265000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	7230000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	2361000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	85442000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	86360000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	38286000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-109827000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-89709000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-82150000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-236606000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	162971000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-80550000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	331896000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	304636000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	296816000	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	692000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	97000	USD
CY2019Q1	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	107770000	USD
CY2018Q1	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	110931000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	656390000	USD
CY2018Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	554898000	USD
CY2017Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	523865000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	656390000	USD
CY2019Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	595377000	USD
CY2018Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	554898000	USD
CY2020Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	58211000	USD
CY2019Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	46938000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	6836000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	1579000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	1578000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	1692000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-389364000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-308513000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-301863000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-1089000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	1002000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	65000	USD
CY2020	kmx	Proceeds From Revolving Line Of Credit And Long Term Debt ProceedsFromRevolvingLineOfCreditAndLongTermDebt	6277600000	USD
CY2019	kmx	Proceeds From Revolving Line Of Credit And Long Term Debt ProceedsFromRevolvingLineOfCreditAndLongTermDebt	4314500000	USD
CY2018	kmx	Proceeds From Revolving Line Of Credit And Long Term Debt ProceedsFromRevolvingLineOfCreditAndLongTermDebt	4203150000	USD
CY2020	kmx	Payments On Revolving Line Of Credit And Long Term Debt PaymentsOnRevolvingLineOfCreditAndLongTermDebt	6199793000	USD
CY2019	kmx	Payments On Revolving Line Of Credit And Long Term Debt PaymentsOnRevolvingLineOfCreditAndLongTermDebt	4155718000	USD
CY2018	kmx	Payments On Revolving Line Of Credit And Long Term Debt PaymentsOnRevolvingLineOfCreditAndLongTermDebt	4169124000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	20102000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	17063000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	16261000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4151000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	894000	USD
CY2018	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	523000	USD
CY2020	kmx	Proceeds From Issuance Of Non Recourse Debt ProceedsFromIssuanceOfNonRecourseDebt	11786432000	USD
CY2019	kmx	Proceeds From Issuance Of Non Recourse Debt ProceedsFromIssuanceOfNonRecourseDebt	10892502000	USD
CY2018	kmx	Proceeds From Issuance Of Non Recourse Debt ProceedsFromIssuanceOfNonRecourseDebt	10198962000	USD
CY2020	kmx	Payments On Non Recourse Debt PaymentsOnNonRecourseDebt	10708564000	USD
CY2019	kmx	Payments On Non Recourse Debt PaymentsOnNonRecourseDebt	10001712000	USD
CY2018	kmx	Payments On Non Recourse Debt PaymentsOnNonRecourseDebt	9296773000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	567747000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	904726000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	579570000	USD
CY2020	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	124397000	USD
CY2019	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	58130000	USD
CY2018	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	73520000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	686983000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	186021000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	413446000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	61013000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	40479000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	31033000	USD
CY2019Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	595377000	USD
CY2018Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	44525000	USD
CY2020Q1	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	481043000	USD
CY2019Q1	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	440669000	USD
CY2018Q1	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	399442000	USD
CY2020Q1	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	117136000	USD
CY2019Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	595377000	USD
CY2018Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	554898000	USD
CY2017Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3108580000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	664112000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	12823000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	38340000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	573638000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	73520000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-6888000	USD
CY2018Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3316849000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	842413000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-13698000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	45870000	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	903101000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	58131000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-2300000	USD
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3357028000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	888433000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-82061000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	48122000	USD
CY2020	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	561657000	USD
CY2020	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	124397000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-5387000	USD
CY2020Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3768875000	USD
CY2020	us-gaap	Nature Of Operations NatureOfOperations	<div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;color:#0000ff;font-weight:bold;">Business and Background</span></div><div style="line-height:120%;padding-bottom:16px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">CarMax, Inc. (“we,” “our,” “us,” “CarMax” and “the company”), including its wholly owned subsidiaries, is the nation’s largest retailer of used vehicles. We operate in </span><span style="font-family:inherit;font-size:10pt;"><span>two</span></span><span style="font-family:inherit;font-size:10pt;"> reportable segments: CarMax Sales Operations and CarMax Auto Finance (“CAF”). Our CarMax Sales Operations segment consists of all aspects of our auto merchandising and service operations, excluding financing provided by CAF. Our CAF segment consists solely of our own finance operation that provides financing to customers buying retail vehicles from CarMax.</span></div>We deliver an unrivaled customer experience by offering a broad selection of quality used vehicles and related products and services at competitive, no-haggle prices using a customer-friendly sales process. Our omni-channel experience provides the majority of our customers with multiple options to interact with us throughout their car-buying journeys, including our mobile apps; carmax.com; over the phone or online with a centralized customer experience consultant; or, in-person at one of our attractive, modern sales facilities. We offer customers a range of related products and services, including the appraisal and purchase of vehicles directly from consumers; the financing of retail vehicle purchases through CAF and third-party finance providers; the sale of extended protection plan (“EPP”) products, which include extended service plans (“ESPs”) and guaranteed asset protection (“GAP”); and vehicle repair service. Vehicles purchased through the appraisal process that do not meet our retail standards are sold to licensed dealers through on-site wholesale auctions.
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2020	kmx	Investment Maturity Period InvestmentMaturityPeriod	three months or less
CY2020Q1	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	481000000.0	USD
CY2019Q1	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	440700000	USD
CY2020	kmx	Number Of Warehouses NumberOfWarehouses	3	warehouse
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	400000	USD
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	42300000	USD
CY2020	kmx	Required Benchmark For Account Delinquency RequiredBenchmarkForAccountDelinquency	P120D
CY2020Q1	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	156700000	USD
CY2019Q1	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	83700000	USD
CY2020Q1	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	142900000	USD
CY2019Q1	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	155900000	USD
CY2020Q1	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	41000000.0	USD
CY2019Q1	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	37800000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	191800000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	167000000.0	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	158600000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	20320000000.0	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	18173100000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	17120200000	USD
CY2019Q1	us-gaap	Receivables Long Term Contracts Or Programs ReceivablesLongTermContractsOrPrograms	25700000	USD
CY2020Q1	us-gaap	Receivables Long Term Contracts Or Programs ReceivablesLongTermContractsOrPrograms	0	USD
CY2020Q1	kmx	Esp Profit Sharing Payment ESPProfitSharingPayment	46000000.0	USD
CY2020	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	1104100000	USD
CY2019	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	972900000	USD
CY2018	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	856600000	USD
CY2020	us-gaap	Financing Interest Expense FinancingInterestExpense	358100000	USD
CY2019	us-gaap	Financing Interest Expense FinancingInterestExpense	289300000	USD
CY2018	us-gaap	Financing Interest Expense FinancingInterestExpense	215000000.0	USD
CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	746000000.0	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	683600000	USD
CY2018	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	641600000	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	185700000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	153800000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	137600000	USD
CY2020	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	560300000	USD
CY2019	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	529800000	USD
CY2018	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	504000000.0	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	0	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-400000	USD
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	38300000	USD
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	35400000	USD
CY2020	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	62000000.0	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	52400000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	47800000	USD
CY2020	us-gaap	Direct Operating Costs DirectOperatingCosts	104300000	USD
CY2019	us-gaap	Direct Operating Costs DirectOperatingCosts	90700000	USD
CY2018	us-gaap	Direct Operating Costs DirectOperatingCosts	83200000	USD
CY2020	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	456000000.0	USD
CY2019	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	438700000	USD
CY2018	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	421200000	USD
CY2020	kmx	Kmx Average Balance Of Loans Held In Porfolio Kmx_averageBalanceOfLoansHeldInPorfolio	13105100000	USD
CY2019	kmx	Kmx Average Balance Of Loans Held In Porfolio Kmx_averageBalanceOfLoansHeldInPorfolio	12150200000	USD
CY2018	kmx	Kmx Average Balance Of Loans Held In Porfolio Kmx_averageBalanceOfLoansHeldInPorfolio	11210800000	USD
CY2020Q1	us-gaap	Non Recourse Debt NonRecourseDebt	13610000000	USD
CY2019Q1	us-gaap	Non Recourse Debt NonRecourseDebt	12540000000	USD
CY2020Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	13617800000	USD
CY2019Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	12510200000	USD
CY2020Q1	us-gaap	Interest Receivable InterestReceivable	56200000	USD
CY2019Q1	us-gaap	Interest Receivable InterestReceivable	49600000	USD
CY2020Q1	us-gaap	Other Receivables OtherReceivables	35500000	USD
CY2019Q1	us-gaap	Other Receivables OtherReceivables	6900000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	157800000	USD
CY2019Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	138200000	USD
CY2020Q1	us-gaap	Notes Receivable Net NotesReceivableNet	13551700000	USD
CY2019Q1	us-gaap	Notes Receivable Net NotesReceivableNet	12428500000	USD
CY2020Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	13617800000	USD
CY2020Q1	kmx	Total Ending Managed Receivables As Percentage By Major Credit Grade TotalEndingManagedReceivablesAsPercentageByMajorCreditGrade	1.000
CY2019Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	12510200000	USD
CY2019Q1	kmx	Total Ending Managed Receivables As Percentage By Major Credit Grade TotalEndingManagedReceivablesAsPercentageByMajorCreditGrade	1.000
CY2019Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	138200000	USD
CY2018Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	128600000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	309000000.0	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	274200000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	142900000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	130000000.0	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	185700000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	153800000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	157800000	USD
CY2019Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	138200000	USD
CY2020Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	13617800000	USD
CY2019Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	12510200000	USD
CY2020Q1	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	468900000	USD
CY2020Q1	kmx	Past Due Receivables As Percentage Of Total Ending Managed Receivables PastDueReceivablesAsPercentageOfTotalEndingManagedReceivables	0.0344
CY2019Q1	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	451800000	USD
CY2019Q1	kmx	Past Due Receivables As Percentage Of Total Ending Managed Receivables PastDueReceivablesAsPercentageOfTotalEndingManagedReceivables	0.0361
CY2020Q1	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	273203000	USD
CY2020Q1	us-gaap	Trading Securities TradingSecurities	22668000	USD
CY2020Q1	us-gaap	Derivative Assets DerivativeAssets	0	USD
CY2020Q1	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	295871000	USD
CY2020Q1	kmx	Item As Percentage Of Total Assets At Fair Value ItemAsPercentageOfTotalAssetsAtFairValue	1.000
CY2020Q1	kmx	Item As Percentage Of Total Assets ItemAsPercentageOfTotalAssets	0.014
CY2020Q1	us-gaap	Derivative Liabilities DerivativeLiabilities	23992000	USD
CY2020Q1	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	23992000	USD
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CY2019Q1	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	372448000	USD
CY2019Q1	us-gaap	Trading Securities TradingSecurities	19263000	USD
CY2019Q1	us-gaap	Derivative Assets DerivativeAssets	1844000	USD
CY2019Q1	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	393555000	USD
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CY2019Q1	kmx	Item As Percentage Of Total Assets ItemAsPercentageOfTotalAssets	0.021
CY2019Q1	us-gaap	Derivative Liabilities DerivativeLiabilities	6120000	USD
CY2019Q1	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	6120000	USD
CY2019Q1	kmx	Item As Percentage Of Total Liabilities ItemAsPercentageOfTotalLiabilities	0
CY2020Q1	us-gaap	Senior Notes SeniorNotes	500000000	USD
CY2019Q1	us-gaap	Senior Notes SeniorNotes	500000000	USD
CY2020Q1	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	546197000	USD
CY2019Q1	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	488590000	USD
CY2020Q1	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4336022000	USD
CY2019Q1	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	4125451000	USD
CY2020Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1266920000	USD
CY2019Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1297393000	USD
CY2020Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3069102000	USD
CY2019Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2828058000	USD
CY2020	us-gaap	Depreciation Depreciation	190600000	USD
CY2019	us-gaap	Depreciation Depreciation	169800000	USD
CY2018	us-gaap	Depreciation Depreciation	158600000	USD
CY2019Q1	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	102800000	USD
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CY2020	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	89300000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	63900000	USD
CY2020Q1	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	117900000	USD
CY2019Q1	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	102800000	USD
CY2020Q1	kmx	Cancellation Reserves Current Portion CancellationReservesCurrentPortion	63500000	USD
CY2019Q1	kmx	Cancellation Reserves Current Portion CancellationReservesCurrentPortion	55600000	USD
CY2018	us-gaap	Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	32700000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	20800000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	225858000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	218497000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	276597000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	47797000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	49596000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	41892000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	273655000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	268093000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	318489000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	146000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	3601000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	81486000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1248000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1301000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-479000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1102000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2300000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	81007000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	272553000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	270393000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	399496000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
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CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.034
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.034
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.031
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.001
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CY2020	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.011
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.003
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.013
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.007
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.007
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.002
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.005
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.004
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.002
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.235
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.243
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.376
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CY2020Q1	kmx	Deferred Tax Assets Leasing Arrangements DeferredTaxAssetsLeasingArrangements	119558000	USD
CY2019Q1	kmx	Deferred Tax Assets Leasing Arrangements DeferredTaxAssetsLeasingArrangements	0	USD
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CY2019Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	48818000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	10346000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	0	USD
CY2020Q1	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	917000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	677000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	310795000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	163281000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	917000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	677000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	309878000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	162604000	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	19742000	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	16960000	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	67589000	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	59537000	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	114212000	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	0	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Inventory Costs DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts	18493000	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Inventory Costs DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts	17279000	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	0	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	6599000	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	0	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	883000	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	220036000	USD
CY2019Q1	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	101258000	USD
CY2020Q1	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	89842000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	61346000	USD
CY2019Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	30270000	USD
CY2018Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	28685000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3493000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2035000	USD
CY2017Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	29955000	USD
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CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2913000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	266000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	607000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4170000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2498000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3342000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	326000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	44000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	304000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3829000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2638000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3701000	USD
CY2020Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	30865000	USD
CY2019Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	30270000	USD
CY2018Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	28685000	USD
CY2020Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	30900000	USD
CY2020Q1	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	9200000	USD
CY2019Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	30300000	USD
CY2019Q1	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	10700000	USD
CY2018Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	28700000	USD
CY2018Q1	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	9600000	USD
CY2020Q1	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	4000000.0	USD
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CY2018Q1	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	2800000	USD
CY2020Q1	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	168835000	USD
CY2019Q1	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	166020000	USD
CY2020Q1	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	310939000	USD
CY2019Q1	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	242759000	USD
CY2020Q1	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-142104000	USD
CY2019Q1	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-76739000	USD
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CY2020Q1	kmx	Financing Obligations FinancingObligations	536739000	USD
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1107000	USD
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CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	675000	USD
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CY2020Q1	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	168835000	USD
CY2019Q1	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	166020000	USD
CY2019Q1	kmx	Financing Obligations FinancingObligations	495626000	USD
CY2020Q1	us-gaap	Non Recourse Debt NonRecourseDebt	13613272000	USD
CY2019Q1	us-gaap	Non Recourse Debt NonRecourseDebt	12535405000	USD
CY2020Q1	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	15402751000	USD
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CY2020Q1	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	433456000	USD
CY2019Q1	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	396350000	USD
CY2020Q1	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	25240000	USD
CY2019Q1	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	24676000	USD
CY2020Q1	us-gaap	Long Term Debt LongTermDebt	14944055000	USD
CY2019Q1	us-gaap	Long Term Debt LongTermDebt	13776534000	USD
CY2020Q1	kmx	Financing Obligation Payments Due Next Fiscal Year FinancingObligationPaymentsDueNextFiscalYear	52504000	USD
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CY2020Q1	kmx	Financing Obligations FinancingObligations	536739000	USD
CY2020Q1	us-gaap	Non Recourse Debt NonRecourseDebt	13610000000	USD
CY2020	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	7000000.0	USD
CY2019	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	6400000	USD
CY2018	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	6900000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	110757000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	76684000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	63420000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	110757000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	76684000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	63420000	USD
CY2020Q1	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	58500000	USD
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CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.326
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.261
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.341
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.273
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.342
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.292
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.291
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.297
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.015
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.024
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.017
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.030
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.007
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.023
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P4Y7M6D
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P4Y7M6D
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P4Y7M6D
CY2020	us-gaap	Net Income Loss NetIncomeLoss	888433000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	842413000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	664112000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	164836000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	174463000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	182660000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	166820000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	175884000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	184470000	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.39
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.83
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.64
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.33
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.79
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.60
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1355679	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4009566	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2993200	shares
CY2017Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-56555000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	9835000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-2988000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	12823000	USD
CY2018	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification	10580000	USD
CY2018Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-54312000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-10162000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	3536000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-13698000	USD
CY2019Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-68010000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-86885000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-4824000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-82061000	USD
CY2020Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-150071000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-68861000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-4560000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-3256000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-16607000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-1101000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-710000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-52254000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-3459000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-2546000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-1874000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-1949000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-1815000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-444000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-471000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-640000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-1430000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-1478000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-1175000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	50824000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	1981000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	1371000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-47083000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-9103000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	17953000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-12452000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-2400000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	5572000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-34631000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-6703000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	12381000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-4614000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	6809000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-3009000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-1220000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	1795000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-1196000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-3394000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	5014000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-1813000	USD
CY2020	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-31237000	USD
CY2019	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-11717000	USD
CY2018	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	14194000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-82061000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-13698000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	12823000	USD
CY2020Q1	kmx	Accumulated Other Comprehensive Income Loss Deferred Taxes AccumulatedOtherComprehensiveIncomeLossDeferredTaxes	48800000	USD
CY2019Q1	kmx	Accumulated Other Comprehensive Income Loss Deferred Taxes AccumulatedOtherComprehensiveIncomeLossDeferredTaxes	21400000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	57656000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	5769000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	7678000	USD
CY2020	kmx	Finance Lease Cost FinanceLeaseCost	13447000	USD
CY2020	us-gaap	Lease Cost LeaseCost	71103000	USD
CY2020Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	449094000	USD
CY2020Q1	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	75320000	USD
CY2020Q1	kmx	Totalleaseassets Totalleaseassets	524414000	USD
CY2020Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	30980000	USD
CY2020Q1	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	5066000	USD
CY2020Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	440671000	USD
CY2020Q1	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	79327000	USD
CY2020Q1	kmx	Totalleaseliabilities Totalleaseliabilities	556044000	USD
CY2020Q1	kmx	Finance Lease Accumulated Depreciation FinanceLeaseAccumulatedDepreciation	9100000	USD
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-02-29
CY2020Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P19Y11M23D
CY2020Q1	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P13Y6M18D
CY2020Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0540	Rate
CY2020Q1	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.1032	Rate
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	57145000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	4027000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4151000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	27136000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	53111000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	54577000	USD
CY2020Q1	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	13053000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	51049000	USD
CY2020Q1	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	13849000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	48441000	USD
CY2020Q1	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	14070000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	47238000	USD
CY2020Q1	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	16729000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	46136000	USD
CY2020Q1	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	12994000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	570667000	USD
CY2020Q1	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	90742000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	818108000	USD
CY2020Q1	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	161437000	USD
CY2020Q1	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	346457000	USD
CY2020Q1	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	77044000	USD
CY2020Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	471651000	USD
CY2020Q1	us-gaap	Finance Lease Liability FinanceLeaseLiability	84393000	USD
CY2020Q1	kmx	Lessee Lease Not Yet Commenced Amount LesseeLeaseNotYetCommencedAmount	36900000	USD
CY2019Q1	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	5139000	USD
CY2019Q1	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	55295000	USD
CY2019Q1	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	6055000	USD
CY2019Q1	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	52142000	USD
CY2019Q1	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	6185000	USD
CY2019Q1	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	48886000	USD
CY2019Q1	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	6288000	USD
CY2019Q1	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	46235000	USD
CY2019Q1	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	5186000	USD
CY2019Q1	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	45067000	USD
CY2019Q1	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	11445000	USD
CY2019Q1	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	595047000	USD
CY2019Q1	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	40298000	USD
CY2019Q1	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	842672000	USD
CY2019Q1	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	8518000	USD
CY2019Q1	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	31780000	USD
CY2019	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	56900000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	52400000	USD
CY2020	us-gaap	Interest Paid InterestPaid	85607000	USD
CY2019	us-gaap	Interest Paid InterestPaid	74204000	USD
CY2018	us-gaap	Interest Paid InterestPaid	69431000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	286008000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	220669000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	353977000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	3840000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	-3066000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	1220000	USD
CY2020	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	48942000	USD
CY2019	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	35848000	USD
CY2018	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	12051000	USD
CY2020Q1	us-gaap	Gain Contingency Unrecorded Amount GainContingencyUnrecordedAmount	40300000	USD
CY2020Q1	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	10500000	USD
CY2019Q1	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	7400000	USD
CY2020Q1	us-gaap	Purchase Obligation PurchaseObligation	197500000	USD
CY2020Q1	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	65300000	USD
CY2019Q2	us-gaap	Revenues Revenues	5366318000	USD
CY2019Q3	us-gaap	Revenues Revenues	5201151000	USD
CY2019Q4	us-gaap	Revenues Revenues	4790028000	USD
CY2020Q1	us-gaap	Revenues Revenues	4962490000	USD
CY2020	us-gaap	Revenues Revenues	20319987000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	742383000	USD
CY2020	us-gaap	Gross Profit GrossProfit	2722340000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	693453000	USD
CY2019Q4	us-gaap	Gross Profit GrossProfit	613647000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	672857000	USD
CY2019Q2	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	115959000	USD
CY2019Q3	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	114131000	USD
CY2019Q4	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	114033000	USD
CY2020Q1	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	111907000	USD
CY2020	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	456030000	USD
CY2019Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	489660000	USD
CY2019Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	480831000	USD
CY2019Q4	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	484848000	USD
CY2020Q1	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	484728000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1940067000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	266744000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	233599000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	173156000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	214934000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	888433000	USD
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.60
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.41
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.05
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.32
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.39
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.59
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.40
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.04
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.30
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.33
CY2018Q2	us-gaap	Revenues Revenues	4792592000	USD
CY2018Q3	us-gaap	Revenues Revenues	4766035000	USD
CY2018Q4	us-gaap	Revenues Revenues	4295871000	USD
CY2019Q1	us-gaap	Revenues Revenues	4318602000	USD
CY2019	us-gaap	Revenues Revenues	18173100000	USD
CY2018Q2	us-gaap	Gross Profit GrossProfit	661340000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	650636000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	569237000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	599378000	USD
CY2019	us-gaap	Gross Profit GrossProfit	2480591000	USD
CY2018Q2	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	115593000	USD
CY2018Q3	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	109667000	USD
CY2018Q4	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	109725000	USD
CY2019Q1	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	103705000	USD
CY2019	kmx	Net Income Loss From Financing NetIncomeLossFromFinancing	438690000	USD
CY2018Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	438234000	USD
CY2018Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	453554000	USD
CY2018Q4	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	409520000	USD
CY2019Q1	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	428967000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1730275000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	238656000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	220890000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	190311000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	192556000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	842413000	USD
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.34
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.25
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.09
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.14
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.83
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.33
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.24
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.09
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.13
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.79

Files In Submission

Name	View Source	Status
0001170010-20-000033-index-headers.html	Edgar Link	pending
0001170010-20-000033-index.html	Edgar Link	pending
0001170010-20-000033.txt	Edgar Link	pending
0001170010-20-000033-xbrl.zip	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
kmx-20200229.xsd	Edgar Link	pending
kmx-20200229_cal.xml	Edgar Link	unprocessable
kmx-20200229_def.xml	Edgar Link	unprocessable
kmx-20200229_lab.xml	Edgar Link	unprocessable
kmx-20200229_pre.xml	Edgar Link	unprocessable
kmxfy2010-k.htm	Edgar Link	pending
kmxfy2010-k_htm.xml	Edgar Link	completed
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report.css	Edgar Link	pending
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$KMX
CARMAX INC Stock $kmx

2020 Q1 Form 10-K Financial Statement

#000117001020000033 Filed on April 21, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KMX CARMAX INC Stock $kmx

2020 Q1 Form 10-K Financial Statement

#000117001020000033 Filed on April 21, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KMX
CARMAX INC Stock $kmx