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Accumulated Other Comprehensive Loss (Changes In and Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Feb. 28, 2021 | Feb. 29, 2020 | Feb. 28, 2019
Actuarial gain (loss) arising during the year | $ 33,913 | $ (68,861) | $ (4,560)
Tax (expense) benefit | (8,184) | 16,607 | 1,101
Actuarial gain (loss) arising during the year, net of tax | 25,729 | (52,254) | (3,459)
Actuarial loss amortization reclassifications in net pension expense | 3,837 | 1,874 | 1,949
Tax expense | (926) | (444) | (471)
Amortization reclassifications recognized in net pension expense, net of tax | 2,911 | 1,430 | 1,478
Net change in retirement benefit plan unrecognized actuarial losses, net of tax | 28,640 | (50,824) | (1,981)
Changes in fair value | (17,122) | (47,083) | (9,103)
Tax benefit | 4,506 | 12,452 | 2,400
Changes in fair value, net of tax | (12,616) | (34,631) | (6,703)
Reclassifications to CarMax Auto Finance income | 20,841 | 4,614 | (6,809)
Tax (expense) benefit | (5,485) | (1,220) | 1,795
Reclassification of hedge losses (gains), net of tax | 15,356 | 3,394 | (5,014)
Net change in cash flow hedge unrecognized losses, net of tax | 2,740 | (31,237) | (11,717)
Total other comprehensive income (loss), net of tax | 31,380 | (82,061) | (13,698)
TOTAL COST OF SALES |  |  |
Actuarial loss amortization reclassifications in net pension expense | 1,617 | 797 | 812
CarMax Auto Finance income |  |  |
Actuarial loss amortization reclassifications in net pension expense | 108 | 49 | 51
Selling, general and administrative expenses |  |  |
Actuarial loss amortization reclassifications in net pension expense | $ 2,112 | $ 1,028 | $ 1,086

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