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Stock and Stock-Based Incentive Plans (Tables) | 9 Months Ended
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Nov. 30, 2025
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Common Stock Repurchases | Common Stock Repurchases
| Three Months Ended |  | Nine Months Ended
| November 30 |  | November 30
| 2025 |  | 2024 |  | 2025 |  | 2024
Number of shares repurchased (in thousands) | 4,613.2 |  |  | 1,505.1 |  |  | 10,486.7 |  |  | 4,327.5 |
Average cost per share | $ | 43.71 |  |  | $ | 76.26 |  |  | $ | 55.44 |  |  | $ | 75.05 |
Available for repurchase, as of end of period (in millions) | $ | 1,355.4 |  |  | $ | 2,035.3 |  |  | $ | 1,355.4 |  |  | $ | 2,035.3 |
Composition of Share-Based Compensation Expense | Composition of Share-Based Compensation Expense
| Three Months Ended |  | Nine Months Ended
| November 30 |  | November 30
(In thousands) | 2025 |  | 2024 |  | 2025 |  | 2024
Cost of sales | $ | 913 |  |  | $ | 1,250 |  |  | $ | 2,782 |  |  | $ | 3,898 |
CarMax Auto Finance income | 988 |  |  | 1,427 |  |  | 3,544 |  |  | 3,561 |
Selling, general and administrative expenses | 14,680 |  |  | 22,252 |  |  | 82,727 |  |  | 101,486 |
Share-based compensation expense, before income taxes | $ | 16,581 |  |  | $ | 24,929 |  |  | $ | 89,053 |  |  | $ | 108,945 |
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) | 2025 |  | 2024 |  | 2025 |  | 2024
Nonqualified stock options | $ | 6,109 |  |  | $ | 6,760 |  |  | $ | 32,984 |  |  | $ | 34,878 |
Cash-settled restricted stock units (RSUs) | 4,577 |  |  | 13,156 |  |  | 21,503 |  |  | 41,823 |
Stock-settled market stock units (MSUs) | 4,461 |  |  | 3,789 |  |  | 18,229 |  |  | 15,556 |
Other share-based incentives: |  |  |  |  |  |  |
Stock-settled performance stock units (PSUs) | 960 |  |  | 713 |  |  | 12,980 |  |  | 13,014 |
Stock-settled deferred stock units (DSUs) | — |  |  | — |  |  | 1,665 |  |  | 1,850 |
Employee stock purchase plan | 474 |  |  | 511 |  |  | 1,692 |  |  | 1,824 |
Total other share-based incentives | 1,434 |  |  | 1,224 |  |  | $ | 16,337 |  |  | $ | 16,688 |
Share-based compensation expense, before income taxes | $ | 16,581 |  |  | $ | 24,929 |  |  | $ | 89,053 |  |  | $ | 108,945 |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award | Stock Incentive Plan Information Share/Unit Activity
| Nine Months Ended November 30, 2025
| Equity Classified |  | Liability Classified
(Shares/units in thousands) | Options | MSUs | Other |  | RSUs
Outstanding as of February 28, 2025 | 7,309 |  | 525 |  | 411 |  |  | 1,524 |
Granted | 1,451 |  | 249 |  | 278 |  |  | 978 |
Exercised or vested and converted | (132) |  | (124) |  | (64) |  |  | (707) |
Cancelled | (37) |  | (6) |  | — |  |  | (111) |
Outstanding as of November 30, 2025 | 8,591 |  | 644 |  | 625 |  |  | 1,684 |
Weighted average grant date fair value per share/unit: |  |  |  |  |
Granted | $ | 26.21 |  | $ | 91.81 |  | $ | 66.09 |  |  | $ | 65.49 |
Ending outstanding | $ | 28.25 |  | $ | 95.27 |  | $ | 70.92 |  |  | $ | 66.77 |
| As of November 30, 2025 |  |
Unrecognized compensation (in millions) | $ | 37.0 |  | $ | 20.6 |  | $ | 6.4 |  |  |

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