Consolidated Statements Of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 8,144,803	$ 7,988,359	$ 17,456,424	$ 15,685,958
TOTAL COST OF SALES	7,407,658	7,172,875	15,843,888	13,945,965
GROSS PROFIT	737,145	815,484	1,612,536	1,739,993
CARMAX AUTO FINANCE INCOME	182,869	200,033	387,342	441,764
Selling, general and administrative expenses	666,041	574,286	1,322,781	1,128,355
Depreciation, Depletion and Amortization, Nonproduction	57,692	52,789	113,340	102,679
Interest expense	32,745	22,410	61,520	42,944
Other income	(4,039)	(1,782)	(1,940)	(27,359)
Earnings before income taxes	167,575	367,814	504,177	935,138
Income tax provision	41,670	82,547	126,007	213,115
NET EARNINGS	$ 125,905	$ 285,267	$ 378,170	$ 722,023
WEIGHTED AVERAGE COMMON SHARES:
Basic, shares	158,801	162,966	159,556	163,058
Diluted, shares	160,218	165,643	161,015	165,969
NET EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.79	$ 1.75	$ 2.37	$ 4.43
Diluted (in dollars per share)	$ 0.79	$ 1.72	$ 2.35	$ 4.35
Used vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 6,284,085	$ 6,104,366	$ 13,298,575	$ 12,261,710
TOTAL COST OF SALES	5,789,098	5,597,842	12,240,108	11,158,179
Wholesale vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	1,690,326	1,701,572	3,806,843	3,075,929
TOTAL COST OF SALES	1,549,669	1,512,559	3,474,519	2,701,072
Total other sales and revenues
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	170,392	182,421	351,006	348,319
TOTAL COST OF SALES	$ 68,891	$ 62,474	$ 129,261	$ 86,714
NET SALES AND OPERATING REVENUES
Percentage of Sales
Item as a percent of net sales and operating revenues	100.00%	100.00%	100.00%	100.00%
TOTAL COST OF SALES
Percentage of Sales
Item as a percent of net sales and operating revenues	90.90%	89.80%	90.80%	88.90%
GROSS PROFIT
Percentage of Sales
Item as a percent of net sales and operating revenues	9.10%	10.20%	9.20%	11.10%
CARMAX AUTO FINANCE INCOME
Percentage of Sales
Item as a percent of net sales and operating revenues	2.20%	2.50%	2.20%	2.80%
Selling, general and administrative expenses
Percentage of Sales
Item as a percent of net sales and operating revenues	8.20%	7.20%	7.60%	7.20%
Depreciation and Amortization, Nonproduction
Percentage of Sales
Item as a percent of net sales and operating revenues	0.70%	0.70%	0.60%	0.70%
Interest expense
Percentage of Sales
Item as a percent of net sales and operating revenues	0.40%	0.30%	0.40%	0.30%
Other income
Percentage of Sales
Item as a percent of net sales and operating revenues	0.00%	0.00%	0.00%	(0.20%)
Earnings before income taxes
Percentage of Sales
Item as a percent of net sales and operating revenues	2.10%	4.60%	2.90%	6.00%
Income tax provision
Percentage of Sales
Item as a percent of net sales and operating revenues	0.50%	1.00%	0.70%	1.40%
NET EARNINGS
Percentage of Sales
Item as a percent of net sales and operating revenues	1.50%	3.60%	2.20%	4.60%
NET SALES AND OPERATING REVENUES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	77.20%	76.40%	76.20%	78.20%
NET SALES AND OPERATING REVENUES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	20.80%	21.30%	21.80%	19.60%
NET SALES AND OPERATING REVENUES | Total other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	2.10%	2.30%	2.00%	2.20%
TOTAL COST OF SALES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	71.10%	70.10%	70.10%	71.10%
TOTAL COST OF SALES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	19.00%	18.90%	19.90%	17.20%
TOTAL COST OF SALES | Total other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	0.80%	0.80%	0.70%	0.60%