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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
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