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CarMax Auto Finance (Components Of CarMax Auto Finance Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2017 | Aug. 31, 2016
Auto Finance Income [Line Items] |  |  |  |
Interest and fee income | $ 213,600 | $ 190,200 | $ 420,300 | $ 374,300
Interest expense | (52,200) | (41,800) | (101,200) | (81,200)
Total interest margin | 161,400 | 148,400 | 319,100 | 293,100
Provision for loan losses | (32,900) | (35,700) | (61,500) | (62,300)
Total interest margin after provision for loan losses | 128,500 | 112,700 | 257,600 | 230,800
Payroll and fringe benefit expense | (8,800) | (7,700) | (17,300) | (15,400)
Other direct expenses | (11,800) | (9,000) | (23,000) | (18,700)
Total direct expenses | (20,600) | (16,700) | (40,300) | (34,100)
CarMax Auto Finance income | 107,936 | 95,969 | 217,299 | 196,727
Total average managed receivables | $ 11,112,000 | $ 10,049,800 | $ 10,970,800 | $ 9,897,400
Interest and fee income, percent |  |  |  |
Auto Finance Income [Line Items] |  |  |  |
Item as percent of total average managed receivables | 7.70% | 7.60% | 7.70% | 7.60%
Interest expense, percent |  |  |  |
Auto Finance Income [Line Items] |  |  |  |
Item as percent of total average managed receivables | (1.90%) | (1.70%) | (1.80%) | (1.60%)
Total interest margin, percent |  |  |  |
Auto Finance Income [Line Items] |  |  |  |
Item as percent of total average managed receivables | 5.80% | 5.90% | 5.80% | 5.90%
Provision for loan losses, percent |  |  |  |
Auto Finance Income [Line Items] |  |  |  |
Item as percent of total average managed receivables | (1.20%) | (1.40%) | 1.10% | (1.30%)
Total interest margin after provision for loan losses, percent |  |  |  |
Auto Finance Income [Line Items] |  |  |  |
Item as percent of total average managed receivables | 4.60% | 4.50% | 4.70% | 4.70%
Payroll and fringe benefit expense, percent |  |  |  |
Auto Finance Income [Line Items] |  |  |  |
Item as percent of total average managed receivables | (0.30%) | (0.30%) | (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%) | (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%) | (0.70%) | (0.70%)
CarMax Auto Finance income, percent |  |  |  |
Auto Finance Income [Line Items] |  |  |  |
Item as percent of total average managed receivables | 3.90% | 3.80% | 4.00% | 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 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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