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CarMax Auto Finance Income (Components Of CarMax Auto Finance Income) (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2012 | Feb. 28, 2014 | Feb. 28, 2013 | Feb. 29, 2012
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and fee income |  |  |  |  |  |  |  |  | $ 548,000,000 |  | $ 495,300,000 |  | $ 448,700,000 |
Interest expense |  |  |  |  |  |  |  |  | (90,000,000) |  | (95,100,000) |  | (106,100,000) |
Total interest margin |  |  |  |  |  |  |  |  | 458,000,000 |  | 400,200,000 |  | 342,600,000 |
Provision for loan losses |  |  |  |  |  |  |  |  | (72,200,000) |  | (56,200,000) |  | (36,400,000) |
Total interest margin after provision for loan losses |  |  |  |  |  |  |  |  | 385,800,000 |  | 344,000,000 |  | 306,200,000 |
Other income |  |  |  |  |  |  |  |  | 100,000 |  |  |  | 1,500,000 |
Payroll and fringe benefit expense |  |  |  |  |  |  |  |  | (22,600,000) |  | (21,200,000) |  | (20,700,000) |
Other direct expenses |  |  |  |  |  |  |  |  | (27,100,000) |  | (23,500,000) |  | (24,800,000) |
Total direct expenses |  |  |  |  |  |  |  |  | (49,700,000) |  | (44,700,000) |  | (45,500,000) |
CarMax Auto Finance income | 80,821,000 | 83,905,000 | 84,422,000 | 87,019,000 | 75,958,000 | 72,454,000 | 75,676,000 | 75,179,000 | 336,167,000 |  | 299,267,000 |  | 262,185,000 |
Total average managed receivables |  |  |  |  |  |  |  |  | $ 6,629,500,000 |  | $ 5,385,500,000 |  | $ 4,662,400,000 |
Interest And Fee Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Item as percent of total average managed receivables |  |  |  |  |  |  |  |  | 8.30% | [1] | 9.20% | [1] | 9.60% | [1]
Interest Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Item as percent of total average managed receivables |  |  |  |  |  |  |  |  | (1.40%) | [1] | (1.80%) | [1] | (2.30%) | [1]
Total Interest Margin [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Item as percent of total average managed receivables |  |  |  |  |  |  |  |  | 6.90% | [1] | 7.40% | [1] | 7.30% | [1]
Provision For Loan Losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Item as percent of total average managed receivables |  |  |  |  |  |  |  |  | (1.10%) | [1] | (1.00%) | [1] | (0.80%) | [1]
Total Interest Margin After Provision For Loan Losses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Item as percent of total average managed receivables |  |  |  |  |  |  |  |  | 5.80% | [1] | 6.40% | [1] | 6.60% | [1]
Payroll And Fringe Benefit Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Item as percent of total average managed receivables |  |  |  |  |  |  |  |  | (0.30%) | [1] | (0.40%) | [1] | (0.40%) | [1]
Other Direct Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Item as percent of total average managed receivables |  |  |  |  |  |  |  |  | (0.40%) | [1] | (0.40%) | [1] | (0.50%) | [1]
Total Direct Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Item as percent of total average managed receivables |  |  |  |  |  |  |  |  | (0.80%) | [1] | (0.80%) | [1] | (1.00%) | [1]
CAF Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auto Finance Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Item as percent of total average managed receivables |  |  |  |  |  |  |  |  | 5.10% | [1] | 5.60% | [1] | 5.60% | [1]
[1] | Percent of total average managed receivables.

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