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Stock and Stock-Based Incentive Plans Stock and Stock-Based Incentive Plans (Tables) | 6 Months Ended
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Aug. 31, 2017
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 |  | Six Months Ended
| August 31 |  | August 31
(In thousands) | 2017 |  | 2016 |  | 2017 |  | 2016
Cost of sales | $ | 1,076 |  |  | $ | 1,054 |  |  | $ | 1,303 |  |  | $ | 2,414 |
CarMax Auto Finance income | 848 |  |  | 747 |  |  | 1,668 |  |  | 1,651 |
Selling, general and administrative expenses | 16,316 |  |  | 27,679 |  |  | 34,409 |  |  | 57,262 |
Share-based compensation expense, before income taxes | $ | 18,240 |  |  | $ | 29,480 |  |  | $ | 37,380 |  |  | $ | 61,327 |
Composition Of Share-Based Compensation Expense - By Grant Type | Composition of Share-Based Compensation Expense – By Grant Type
| Three Months Ended |  | Six Months Ended
| August 31 |  | August 31
(In thousands) | 2017 |  | 2016 |  | 2017 |  | 2016
Nonqualified stock options | $ | 5,916 |  |  | $ | 15,090 |  |  | $ | 16,286 |  |  | $ | 28,221 |
Cash-settled restricted stock units (RSUs) | 9,785 |  |  | 9,085 |  |  | 12,903 |  |  | 21,461 |
Stock-settled market stock units (MSUs) | 2,543 |  |  | 3,698 |  |  | 6,164 |  |  | 7,348 |
Stock-settled performance stock units (PSUs) | (863 | ) |  | 199 |  |  | 490 |  |  | 2,332 |
Employee stock purchase plan | 381 |  |  | 355 |  |  | 795 |  |  | 765 |
Restricted stock awards (RSAs) | 478 |  |  | 1,053 |  |  | 742 |  |  | 1,200 |
Share-based compensation expense, before income taxes | $ | 18,240 |  |  | $ | 29,480 |  |  | $ | 37,380 |  |  | $ | 61,327 |
Schedule of Stock Incentive Plan Information | Share/Unit Activity
| Six Months Ended August 31, 2017
| Equity Classified |  | Liability Classified
(Shares/units in thousands) | Options | MSUs | PSUs | RSAs |  | RSUs
Outstanding as of February 28, 2017 | 7,753 |  | 504 |  | 149 |  | 50 |  |  | 1,406 |
Granted | 1,932 |  | 159 |  | 74 |  | 29 |  |  | 628 |
Exercised or vested and converted | (621 | ) | (223 | ) | — |  | (28 | ) |  | (463 | )
Cancelled | (18 | ) | (5 | ) | — |  | — |  |  | (58 | )
Outstanding as of August 31, 2017 | 9,046 |  | 435 |  | 223 |  | 51 |  |  | 1,513 |
Weighted average grant date fair value per share/unit: |  |  |  |  |  |
Granted | $ | 16.11 |  | $ | 73.59 |  | $ | 58.38 |  | $ | 62.35 |  |  | $ | 58.39 |
Ending outstanding | $ | 15.48 |  | $ | 73.72 |  | $ | 60.10 |  | $ | 58.06 |  |  | $ | 59.34 |
| As of August 31, 2017 |  |
Unrecognized compensation (in mil lions) | $ | 47.6 |  | $ | 15.0 |  | $ | 3.9 |  | $ | 2.1 |  |  |
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 |  | Six Months Ended
| August 31 |  | August 31
| 2017 |  | 2016 |  | 2017 |  | 2016
Number of shares repurchased (in thousands) | 2,453.1 |  |  | 2,365.2 |  |  | 5,487.8 |  |  | 4,934.7 |
Average cost per share | $ | 63.78 |  |  | $ | 53.18 |  |  | $ | 61.69 |  |  | $ | 52.25 |
Available for repurchase, as of end of period (in millions) | $ | 1,251.8 |  |  | $ | 1,890.2 |  |  | $ | 1,251.8 |  |  | $ | 1,890.2 |

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