Consolidated Statements Of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 5,184,944	$ 4,790,028	$ 13,785,892	$ 15,357,497
TOTAL COST OF SALES	4,553,514	4,176,381	12,048,136	13,308,014
GROSS PROFIT	631,430	613,647	1,737,756	2,049,483
CARMAX AUTO FINANCE INCOME	176,445	114,033	374,590	344,123
Selling, general and administrative expenses	478,797	484,848	1,342,721	1,455,339
Interest expense	19,462	21,843	65,889	60,700
Other (income) expense	(887)	(6,570)	728	(6,786)
Earnings before income taxes	310,503	227,559	703,008	884,353
Income tax provision	75,203	54,403	166,034	210,854
NET EARNINGS	$ 235,300	$ 173,156	$ 536,974	$ 673,499
WEIGHTED AVERAGE COMMON SHARES:
Basic, shares	163,732	164,273	163,278	165,321
Diluted, shares	165,773	166,534	164,976	167,154
NET EARNINGS PER SHARE:
Basic (in dollars per share)	$ 1.44	$ 1.05	$ 3.29	$ 4.07
Diluted (in dollars per share)	$ 1.42	$ 1.04	$ 3.25	$ 4.03
Used vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 4,209,748	$ 4,028,811	$ 11,385,183	$ 12,915,763
TOTAL COST OF SALES	3,791,134	3,615,704	10,223,875	11,549,445
Wholesale vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	828,362	610,983	1,990,296	1,951,718
TOTAL COST OF SALES	713,961	504,177	1,669,595	1,601,573
Total other sales and revenues
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	146,834	150,234	410,413	490,016
TOTAL COST OF SALES	$ 48,419	$ 56,500	$ 154,666	$ 156,996
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	87.80%	87.20%	87.40%	86.70%
GROSS PROFIT
Percentage of Sales
Item as a percent of net sales and operating revenues	12.20%	12.80%	12.60%	13.30%
CARMAX AUTO FINANCE INCOME
Percentage of Sales
Item as a percent of net sales and operating revenues	3.40%	2.40%	2.70%	2.20%
Selling, general and administrative expenses
Percentage of Sales
Item as a percent of net sales and operating revenues	9.20%	10.10%	9.70%	9.50%
Interest expense
Percentage of Sales
Item as a percent of net sales and operating revenues	0.40%	0.50%	0.50%	0.40%
Other (income) expense
Percentage of Sales
Item as a percent of net sales and operating revenues	0.00%	(0.10%)	0.00%	0.00%
Earnings before income taxes
Percentage of Sales
Item as a percent of net sales and operating revenues	6.00%	4.80%	5.10%	5.80%
Income tax provision
Percentage of Sales
Item as a percent of net sales and operating revenues	1.50%	1.10%	1.20%	1.40%
NET EARNINGS
Percentage of Sales
Item as a percent of net sales and operating revenues	4.50%	3.60%	3.90%	4.40%
NET SALES AND OPERATING REVENUES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	81.20%	84.10%	82.60%	84.10%
NET SALES AND OPERATING REVENUES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	16.00%	12.80%	14.40%	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	2.80%	3.10%	3.00%	3.20%
TOTAL COST OF SALES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	73.10%	75.50%	74.20%	75.20%
TOTAL COST OF SALES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	13.80%	10.50%	12.10%	10.40%
TOTAL COST OF SALES | Total other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	0.90%	1.20%	1.10%	1.00%