Consolidated Statements Of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 5,372,166	$ 5,201,151	$ 8,600,948	$ 10,567,469
TOTAL COST OF SALES	4,620,023	4,507,698	7,494,622	9,131,633
GROSS PROFIT	752,143	693,453	1,106,326	1,435,836
CARMAX AUTO FINANCE INCOME	147,195	114,131	198,145	230,090
Selling, general and administrative expenses	490,208	480,831	863,924	970,491
Interest expense	22,469	21,073	46,427	38,857
Other (income) expense	(1,680)	143	1,615	(216)
Earnings before income taxes	388,341	305,537	392,505	656,794
Income tax provision	91,645	71,938	90,831	156,451
NET EARNINGS	$ 296,696	$ 233,599	$ 301,674	$ 500,343
WEIGHTED AVERAGE COMMON SHARES:
Basic, shares	163,434	165,354	163,053	165,839
Diluted, shares	165,623	167,272	164,580	167,458
NET EARNINGS PER SHARE:
Basic (in dollars per share)	$ 1.82	$ 1.41	$ 1.85	$ 3.02
Diluted (in dollars per share)	$ 1.79	$ 1.40	$ 1.83	$ 2.99
Used vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 4,389,233	$ 4,346,295	$ 7,175,435	$ 8,886,952
TOTAL COST OF SALES	3,908,065	3,889,917	6,432,741	7,933,741
Wholesale vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	819,082	678,286	1,161,934	1,340,735
TOTAL COST OF SALES	674,712	560,906	955,634	1,097,396
Total other sales and revenues
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	163,851	176,570	263,579	339,782
TOTAL COST OF SALES	$ 37,246	$ 56,875	$ 106,247	$ 100,496
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	86.00%	86.70%	87.10%	86.40%
GROSS PROFIT
Percentage of Sales
Item as a percent of net sales and operating revenues	14.00%	13.30%	12.90%	13.60%
CARMAX AUTO FINANCE INCOME
Percentage of Sales
Item as a percent of net sales and operating revenues	2.70%	2.20%	2.30%	2.20%
Selling, general and administrative expenses
Percentage of Sales
Item as a percent of net sales and operating revenues	9.10%	9.20%	10.00%	9.20%
Interest expense
Percentage of Sales
Item as a percent of net sales and operating revenues	0.40%	0.40%	0.50%	0.40%
Other (income) expense
Percentage of Sales
Item as a percent of net sales and operating revenues	0.00%	0.00%	0.00%	0.00%
Earnings before income taxes
Percentage of Sales
Item as a percent of net sales and operating revenues	7.20%	5.90%	4.60%	6.20%
Income tax provision
Percentage of Sales
Item as a percent of net sales and operating revenues	1.70%	1.40%	1.10%	1.50%
NET EARNINGS
Percentage of Sales
Item as a percent of net sales and operating revenues	5.50%	4.50%	3.50%	4.70%
NET SALES AND OPERATING REVENUES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	81.70%	83.60%	83.40%	84.10%
NET SALES AND OPERATING REVENUES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	15.20%	13.00%	13.50%	12.70%
NET SALES AND OPERATING REVENUES | Total other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	3.00%	3.40%	3.10%	3.20%
TOTAL COST OF SALES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	72.70%	74.80%	74.80%	75.10%
TOTAL COST OF SALES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	12.60%	10.80%	11.10%	10.40%
TOTAL COST OF SALES | Total other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	0.70%	1.10%	1.20%	1.00%