Consolidated Statements Of Earnings - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 28, 2018
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 20,319,987	$ 18,173,100	$ 17,120,209
TOTAL COST OF SALES	17,597,647	15,692,509	14,791,350
GROSS PROFIT	2,722,340	2,480,591	2,328,859
CARMAX AUTO FINANCE INCOME	456,030	438,690	421,182
Selling, general and administrative expenses	1,940,067	1,730,275	1,617,051
Interest expense	83,007	75,792	70,745
Other (income) expense	(5,690)	408	(1,363)
Earnings before income taxes	1,160,986	1,112,806	1,063,608
Income tax provision	272,553	270,393	399,496
NET EARNINGS	$ 888,433	$ 842,413	$ 664,112
WEIGHTED AVERAGE COMMON SHARES:
Basic (in shares)	164,836	174,463	182,660
Diluted (in shares)	166,820	175,884	184,470
NET EARNINGS PER SHARE:
Basic (in dollars per share)	$ 5.39	$ 4.83	$ 3.64
Diluted (in dollars per share)	$ 5.33	$ 4.79	$ 3.60
Used vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 17,169,462	$ 15,172,772	$ 14,392,360
TOTAL COST OF SALES	15,349,401	13,544,033	12,824,741
Wholesale vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	2,500,042	2,392,992	2,181,156
TOTAL COST OF SALES	2,045,680	1,961,959	1,788,704
Other sales and revenues
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	650,483	607,336	546,693
TOTAL COST OF SALES	$ 202,566	$ 186,517	$ 177,905
NET SALES AND OPERATING REVENUES
Percentage of Sales
Item as a percent of net sales and operating revenues	100.00%	100.00%	100.00%
TOTAL COST OF SALES
Percentage of Sales
Item as a percent of net sales and operating revenues	86.60%	86.40%	86.40%
GROSS PROFIT
Percentage of Sales
Item as a percent of net sales and operating revenues	13.40%	13.60%	13.60%
CARMAX AUTO FINANCE INCOME
Percentage of Sales
Item as a percent of net sales and operating revenues	2.20%	2.40%	2.50%
Selling, general and administrative expenses
Percentage of Sales
Item as a percent of net sales and operating revenues	9.50%	9.50%	9.40%
Interest expense
Percentage of Sales
Item as a percent of net sales and operating revenues	0.40%	0.40%	0.40%
Other (income) expense
Percentage of Sales
Item as a percent of net sales and operating revenues	0.00%	0.00%	0.00%
Earnings before income taxes
Percentage of Sales
Item as a percent of net sales and operating revenues	5.70%	6.10%	6.20%
Income tax provision
Percentage of Sales
Item as a percent of net sales and operating revenues	1.30%	1.50%	2.30%
NET EARNINGS
Percentage of Sales
Item as a percent of net sales and operating revenues	4.40%	4.60%	3.90%
NET SALES AND OPERATING REVENUES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	84.50%	83.50%	84.10%
NET SALES AND OPERATING REVENUES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	12.30%	13.20%	12.70%
NET SALES AND OPERATING REVENUES | Other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	3.20%	3.30%	3.20%
TOTAL COST OF SALES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	75.50%	74.50%	74.90%
TOTAL COST OF SALES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	10.10%	10.80%	10.40%
TOTAL COST OF SALES | Other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	1.00%	1.00%	1.00%