Consolidated Statements Of Earnings - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 29, 2020
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 31,900,412	$ 18,950,149	$ 20,319,987
TOTAL COST OF SALES	28,612,870	16,571,024	17,597,647
GROSS PROFIT	3,287,542	2,379,125	2,722,340
CARMAX AUTO FINANCE INCOME	801,507	562,810	456,030
Selling, General and Administrative Expense	2,325,220	1,704,419	1,750,168
Depreciation, Depletion and Amortization, Nonproduction	211,956	194,356	189,899
Interest expense	94,095	86,178	83,007
Nonoperating Income (Expense)	(34,568)	(8,275)	(5,690)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	1,492,346	965,257	1,160,986
Income tax provision	341,049	218,338	272,553
Net earnings	$ 1,151,297	$ 746,919	$ 888,433
Basic (in shares)	162,410	163,183	164,836
Diluted (in shares)	165,176	165,133	166,820
Basic (in dollars per share)	$ 7.09	$ 4.58	$ 5.39
Diluted (in dollars per share)	$ 6.97	$ 4.52	$ 5.33
Used vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 24,437,095	$ 15,713,583	$ 17,169,462
TOTAL COST OF SALES	22,398,651	14,124,715	15,349,401
Wholesale vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	6,763,813	2,668,753	2,500,042
TOTAL COST OF SALES	5,999,277	2,245,431	2,045,680
Other sales and revenues
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	699,504	567,813	650,483
TOTAL COST OF SALES	$ 214,942	$ 200,878	$ 202,566
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	89.70%	87.40%	86.60%
GROSS PROFIT
Percentage of Sales
Item as a percent of net sales and operating revenues	10.30%	12.60%	13.40%
CARMAX AUTO FINANCE INCOME
Percentage of Sales
Item as a percent of net sales and operating revenues	2.50%	3.00%	2.20%
Selling, general and administrative expenses
Percentage of Sales
Item as a percent of net sales and operating revenues	7.30%	9.00%	8.60%
Depreciation and Amortization
Percentage of Sales
Item as a percent of net sales and operating revenues	0.70%	1.00%	0.90%
Interest expense
Percentage of Sales
Item as a percent of net sales and operating revenues	0.30%	0.50%	0.40%
Other (income) expense
Percentage of Sales
Item as a percent of net sales and operating revenues	(0.10%)	0.00%	0.00%
Earnings before income taxes
Percentage of Sales
Item as a percent of net sales and operating revenues	4.70%	5.10%	5.70%
Income tax provision
Percentage of Sales
Item as a percent of net sales and operating revenues	1.10%	1.20%	1.30%
NET EARNINGS
Percentage of Sales
Item as a percent of net sales and operating revenues	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	76.60%	82.90%	84.50%
NET SALES AND OPERATING REVENUES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	21.20%	14.10%	12.30%
NET SALES AND OPERATING REVENUES | Other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	2.20%	3.00%	3.20%
TOTAL COST OF SALES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	70.20%	74.50%	75.50%
TOTAL COST OF SALES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	18.80%	11.80%	10.10%
TOTAL COST OF SALES | Other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	0.70%	1.10%	1.00%