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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. 29, 2024
Feb. 28, 2023
Feb. 28, 2022
Actuarial gain arising during the year $ 9,289 $ 34,836 $ 22,517
Tax expense (2,208) (8,359) (5,483)
Actuarial gain arising during the year, net of tax 7,081 26,477 17,034
Actuarial loss amortization reclassifications in net pension expense 516 2,545 3,473
Tax expense (123) (611) (846)
Amortization reclassifications recognized in net pension expense, net of tax 393 1,934 2,627
Net change in retirement benefit plan unrecognized actuarial losses, net of tax 7,474 28,411 19,661
Changes in fair value (9,291) 180,510 54,105
Tax benefit (expense) 2,348 (44,318) (13,894)
Changes in fair value, net of tax (6,943) 136,192 40,211
Reclassifications to CarMax Auto Finance income (52,354) (26,859) 16,680
Tax benefit (expense) 13,233 6,547 (4,283)
Reclassification of hedge (gains) losses, net of tax (39,121) (20,312) 12,397
Net change in cash flow hedge unrecognized gains, net of tax (46,064) 115,880 52,608
Total other comprehensive (loss) income, net of tax (38,590) 144,291 72,269
TOTAL COST OF SALES      
Actuarial loss amortization reclassifications in net pension expense 231 1,084 1,451
CarMax Auto Finance income      
Actuarial loss amortization reclassifications in net pension expense 15 70 84
Selling, general and administrative expenses      
Actuarial loss amortization reclassifications in net pension expense $ 270 $ 1,391 $ 1,938