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Stock And Stock-Based Incentive Plans (Tables) | 9 Months Ended
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Nov. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Composition Of Share-Based Compensation Expense | Composition of Share-Based Compensation Expense
| Three Months Ended |  | Nine Months Ended
| November 30 |  | November 30
(In thousands) | 2016 |  | 2015 |  | 2016 |  | 2015
Cost of sales | $ | 584 |  |  | $ | 394 |  |  | $ | 2,998 |  |  | $ | 1,459 |
CarMax Auto Finance income | 663 |  |  | 502 |  |  | 2,314 |  |  | 1,100 |
Selling, general and administrative expenses | 10,522 |  |  | 11,178 |  |  | 67,784 |  |  | 43,728 |
Share-based compensation expense, before income taxes | $ | 11,769 |  |  | $ | 12,074 |  |  | $ | 73,096 |  |  | $ | 46,287 |
Composition Of Share-Based Compensation Expense - By Grant Type | Composition of Share-Based Compensation Expense – By Grant Type
| Three Months Ended |  | Nine Months Ended
| November 30 |  | November 30
(In thousands) | 2016 |  | 2015 |  | 2016 |  | 2015
Nonqualified stock options | $ | 4,756 |  |  | $ | 5,794 |  |  | $ | 32,977 |  |  | $ | 20,064 |
Cash-settled restricted stock units (RSUs) | 4,490 |  |  | 2,960 |  |  | 25,951 |  |  | 14,358 |
Stock-settled market stock units (MSUs) | 2,463 |  |  | 2,586 |  |  | 9,811 |  |  | 8,123 |
Stock-settled performance stock units (PSUs) | (488 | ) |  | 341 |  |  | 1,844 |  |  | 1,579 |
Employee stock purchase plan | 305 |  |  | 296 |  |  | 1,070 |  |  | 1,003 |
Restricted stock awards (RSAs) | 243 |  |  | 97 |  |  | 1,443 |  |  | 1,160 |
Share-based compensation expense, before income taxes | $ | 11,769 |  |  | $ | 12,074 |  |  | $ | 73,096 |  |  | $ | 46,287 |
Schedule Of Stock Incentive Plan Information | Share/Unit Activity
| Nine Months Ended November 30, 2016
| Equity Classified |  | Liability Classified
(Shares/units in thousands) | Options | MSUs | PSUs | RSAs |  | RSUs
Outstanding as of February 29, 2016 | 7,322 |  | 543 |  | 66 |  | 17 |  |  | 1,320 |
Granted | 2,310 |  | 171 |  | 83 |  | 49 |  |  | 632 |
Exercised or vested and converted | (1,144 | ) | (210 | ) | — |  | (17 | ) |  | (436 | )
Cancelled | (4 | ) | (1 | ) | — |  | — |  |  | (89 | )
Outstanding as of November 30, 2016 | 8,484 |  | 503 |  | 149 |  | 49 |  |  | 1,427 |
Weighted average grant date fair value per share/unit: |  |  |  |  |  |
Granted | $ | 14.19 |  | $ | 63.96 |  | $ | 51.63 |  | $ | 50.65 |  |  | $ | 51.63 |
Ending outstanding | $ | 14.99 |  | $ | 65.66 |  | $ | 60.94 |  | $ | 50.65 |  |  | $ | 55.04 |
| As of November 30, 2016 |  |
Unrecognized compensation (in mil lions) | $ | 37.4 |  | $ | 13.6 |  | $ | 2.5 |  | $ | 1.2 |  |  |
Share Repurchase Program |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule Of Common Stock Repurchases | Common Stock Repurchases
| Three Months Ended |  | Nine Months Ended
| November 30 |  | November 30
| 2016 |  | 2015 |  | 2016 |  | 2015
Number of shares repurchased (in thousands) | 3,780.5 |  |  | 7,680.8 |  |  | 8,715.2 |  |  | 13,336.1 |
Average cost per share | $ | 52.56 |  |  | $ | 58.03 |  |  | $ | 52.38 |  |  | $ | 61.14 |
Available for repurchase, as of end of period (in millions) | $ | 1,691.5 |  |  | $ | 1,553.8 |  |  | $ | 1,691.5 |  |  | $ | 1,553.8 |

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