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CarMax Auto Finance (Components Of CarMax Auto Finance Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
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May 31, 2018 | May 31, 2017
Auto Finance Income [Line Items] |  |
Interest and fee income | $ 232,300 | $ 206,700
Interest expense | (63,800) | (49,000)
Total interest margin | 168,500 | 157,700
Provision for loan losses | (30,900) | (28,600)
Total interest margin after provision for loan losses | 137,600 | 129,100
Payroll and fringe benefit expense | (9,600) | (8,500)
Other direct expenses | (12,400) | (11,200)
Total direct expenses | (22,000) | (19,700)
CarMax Auto Finance income | 115,593 | 109,363
Total average managed receivables | $ 11,775,400 | $ 10,829,500
Interest and fee income, percent |  |
Auto Finance Income [Line Items] |  |
Item as percent of total average managed receivables | 7.90% | 7.60%
Interest expense, percent |  |
Auto Finance Income [Line Items] |  |
Item as percent of total average managed receivables | (2.20%) | (1.80%)
Total interest margin, percent |  |
Auto Finance Income [Line Items] |  |
Item as percent of total average managed receivables | 5.70% | 5.80%
Provision for loan losses, percent |  |
Auto Finance Income [Line Items] |  |
Item as percent of total average managed receivables | (1.00%) | (1.10%)
Total interest margin after provision for loan losses, percent |  |
Auto Finance Income [Line Items] |  |
Item as percent of total average managed receivables | 4.70% | 4.80%
Payroll and fringe benefit expense, percent |  |
Auto Finance Income [Line Items] |  |
Item as percent of total average managed receivables | (0.30%) | (0.30%)
Other direct expenses, percent |  |
Auto Finance Income [Line Items] |  |
Item as percent of total average managed receivables | (0.40%) | (0.40%)
Total direct expenses, percent |  |
Auto Finance Income [Line Items] |  |
Item as percent of total average managed receivables | (0.70%) | (0.70%)
CarMax Auto Finance income, percent |  |
Auto Finance Income [Line Items] |  |
Item as percent of total average managed receivables | 3.90% | 4.00%

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- Definition Income (loss) generated from the entity's financing of used and new vehicle retail sales, excluding the allocation of indirect costs or income. + References No definition available. + Details
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- Definition The aggregate direct operating costs incurred during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition This element represents interest incurred for borrowed money which was used to produce goods or render services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.12) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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