Intangible Assets, Goodwill and Other (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2023	Feb. 28, 2022
Internally developed software
Schedule of Intangible Assets (Finite-Lived and Indefinite-Lived) [Line Items]
Finite-Lived Intangible Assets, Gross	$ 52,900	$ 52,900
Finite-Lived Intangible Assets, Accumulated Amortization	(13,225)	(5,668)
Finite-Lived Intangible Assets, Net	39,675	47,232
Customer Relationships
Schedule of Intangible Assets (Finite-Lived and Indefinite-Lived) [Line Items]
Finite-Lived Intangible Assets, Gross	133,200	133,200
Finite-Lived Intangible Assets, Accumulated Amortization	(13,712)	(5,876)
Finite-Lived Intangible Assets, Net	119,488	127,324
Goodwill	141,258	141,258
Indefinite-lived Intangible Assets (Excluding Goodwill)	31,900	31,900
Intangible Assets, Gross (Excluding Goodwill)	218,000	218,000
Finite-Lived Intangible Assets, Accumulated Amortization	(26,937)	(11,544)
Intangible Assets, Net (Excluding Goodwill)	191,063	206,456
Amortization of Intangible Assets	15,400	$ 11,500
Finite-Lived Intangible Asset, Expected Amortization, Year One	15,400
Finite-Lived Intangible Asset, Expected Amortization, Year Two	15,400
Finite-Lived Intangible Asset, Expected Amortization, Year Three	15,400
Finite-Lived Intangible Asset, Expected Amortization, Year Five	15,400
Finite-Lived Intangible Asset, Expected Amortization, Year Four	15,400
CarMax Sales Operations
Goodwill [Line Items]
Goodwill	98,900
Edmunds
Goodwill [Line Items]
Goodwill	$ 42,400