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Accumulated Other Comprehensive Loss (Changes In and Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Feb. 28, 2014 | Feb. 28, 2013 | Feb. 29, 2012
Actuarial gain (loss) arising during the year | $ 15,465 |  | $ (16,694) |  | $ (35,786) |
Tax (expense) benefit | (5,752) |  | 6,238 |  | 13,195 |
Actuarial gain (loss) arising during the year, net of tax | 9,713 |  | (10,456) |  | (22,591) |
Actuarial loss amortization reclassifications in net pension expense | 1,674 |  | 1,200 |  | 461 |
Tax expense | (623) |  | (449) |  | (116) |
Amortization reclassifications recognized in net pension expense, net of tax | 1,051 |  | 751 |  | 345 |
Net change in retirement benefit plan unrecognized actuarial losses, net of tax | 10,764 |  | (9,705) |  | (22,246) |
Effective portion of changes in fair value | (5,286) |  | (6,691) |  | (22,968) |
Tax (expense) benefit | 2,070 | [1] | 11,176 | [1] | 245 | [1]
Effective portion of changes in fair value, net of tax | (3,216) |  | 4,485 |  | (22,723) |
Reclassifications to CarMax Auto Finance income | 9,872 |  | 12,981 |  | 7,567 |
Tax expense | (3,883) |  | (5,110) |  | 0 |
Reclassifications to CarMax Auto Finance income, net of tax | 5,989 |  | 7,871 |  | 7,567 |
Net change in cash flow hedge unrecognzied losses, net of tax | 2,773 |  | 12,356 |  | (15,156) |
Other comprehensive income (loss), net of taxes | 13,537 |  | 2,651 |  | (37,402) |
Tax benefit adjustment |  |  | 8,518 |  |  |
Cost Of Sales [Member] |  |  |  |  |  |
Actuarial loss amortization reclassifications in net pension expense | 669 |  | 483 |  | 182 |
Carmax Auto Finance [Member] |  |  |  |  |  |
Actuarial loss amortization reclassifications in net pension expense | 38 |  | 28 |  | 12 |
Selling, General And Administrative Expenses [Member] |  |  |  |  |  |
Actuarial loss amortization reclassifications in net pension expense | $ 967 |  | $ 689 |  | $ 267 |
[1] | The year ended February 28, 2013, includes a tax benefit adjustment of $8,518 related to prior years.

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