XML 44 R33.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
May 31, 2018 | May 31, 2017
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 4,792.6 | $ 4,542.3
Used vehicle sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 4,021.0 | 3,843.4
Wholesale vehicle sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 617.7 | 553.4
Extended protection plan revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 100.1 | 91.9
Third-party finance fees, net |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (14.5) | (11.4)
Service revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 36.5 | 33.7
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 31.8 | 31.4
Total other sales and revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 153.9 | $ 145.6

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ProductOrServiceAxis=kmx_UsedVehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=kmx_WholesaleVehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=kmx_ExtendedprotectionplanDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=kmx_ThirdpartyfinancefeesDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=kmx_ServiceDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=kmx_OtherDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=kmx_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |