Consolidated Statements Of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 7,988,359	$ 5,372,166	$ 15,685,958	$ 8,600,948
TOTAL COST OF SALES	7,172,875	4,620,023	13,945,965	7,494,622
GROSS PROFIT	815,484	752,143	1,739,993	1,106,326
CARMAX AUTO FINANCE INCOME	200,033	147,195	441,764	198,145
Selling, general and administrative expenses	574,286	441,923	1,128,355	766,814
Depreciation, Depletion and Amortization, Nonproduction	52,789	48,285	102,679	97,110
Interest expense	22,410	22,469	42,944	46,427
Other (income) expense	(1,782)	(1,680)	(27,359)	1,615
Earnings before income taxes	367,814	388,341	935,138	392,505
Income tax provision	82,547	91,645	213,115	90,831
NET EARNINGS	$ 285,267	$ 296,696	$ 722,023	$ 301,674
WEIGHTED AVERAGE COMMON SHARES:
Basic, shares	162,966	163,434	163,058	163,053
Diluted, shares	165,643	165,623	165,969	164,580
NET EARNINGS PER SHARE:
Basic (in dollars per share)	$ 1.75	$ 1.82	$ 4.43	$ 1.85
Diluted (in dollars per share)	$ 1.72	$ 1.79	$ 4.35	$ 1.83
Used vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 6,104,366	$ 4,389,233	$ 12,261,710	$ 7,175,435
TOTAL COST OF SALES	5,597,842	3,908,065	11,158,179	6,432,741
Wholesale vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	1,701,572	819,082	3,075,929	1,161,934
TOTAL COST OF SALES	1,512,559	674,712	2,701,072	955,634
Total other sales and revenues
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	182,421	163,851	348,319	263,579
TOTAL COST OF SALES	$ 62,474	$ 37,246	$ 86,714	$ 106,247
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	89.80%	86.00%	88.90%	87.10%
GROSS PROFIT
Percentage of Sales
Item as a percent of net sales and operating revenues	10.20%	14.00%	11.10%	12.90%
CARMAX AUTO FINANCE INCOME
Percentage of Sales
Item as a percent of net sales and operating revenues	2.50%	2.70%	2.80%	2.30%
Selling, general and administrative expenses
Percentage of Sales
Item as a percent of net sales and operating revenues	7.20%	8.20%	7.20%	8.90%
Depreciation and Amortization, Nonproduction
Percentage of Sales
Item as a percent of net sales and operating revenues	0.70%	0.90%	0.70%	1.10%
Interest expense
Percentage of Sales
Item as a percent of net sales and operating revenues	0.30%	0.40%	0.30%	0.50%
Other (income) expense
Percentage of Sales
Item as a percent of net sales and operating revenues	0.00%	0.00%	(0.20%)	0.00%
Earnings before income taxes
Percentage of Sales
Item as a percent of net sales and operating revenues	4.60%	7.20%	6.00%	4.60%
Income tax provision
Percentage of Sales
Item as a percent of net sales and operating revenues	1.00%	1.70%	1.40%	1.10%
NET EARNINGS
Percentage of Sales
Item as a percent of net sales and operating revenues	3.60%	5.50%	4.60%	3.50%
NET SALES AND OPERATING REVENUES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	76.40%	81.70%	78.20%	83.40%
NET SALES AND OPERATING REVENUES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	21.30%	15.20%	19.60%	13.50%
NET SALES AND OPERATING REVENUES | Total other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	2.30%	3.00%	2.20%	3.10%
TOTAL COST OF SALES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	70.10%	72.70%	71.10%	74.80%
TOTAL COST OF SALES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	18.90%	12.60%	17.20%	11.10%
TOTAL COST OF SALES | Total other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	0.80%	0.70%	0.60%	1.20%