Consolidated Statements Of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 8,527,759	$ 5,184,944	$ 24,213,717	$ 13,785,892
TOTAL COST OF SALES	7,691,199	4,553,514	21,637,164	12,048,136
GROSS PROFIT	836,560	631,430	2,576,553	1,737,756
CARMAX AUTO FINANCE INCOME	165,968	176,445	607,732	374,590
Selling, general and administrative expenses	575,930	430,781	1,704,285	1,197,595
Depreciation, Depletion and Amortization, Nonproduction	54,428	48,016	157,107	145,126
Interest expense	24,303	19,462	67,247	65,889
Other (income) expense	(8,094)	(887)	(35,453)	728
Earnings before income taxes	355,961	310,503	1,291,099	703,008
Income tax provision	86,523	75,203	299,638	166,034
NET EARNINGS	$ 269,438	$ 235,300	$ 991,461	$ 536,974
WEIGHTED AVERAGE COMMON SHARES:
Basic, shares	162,006	163,732	162,710	163,278
Diluted, shares	164,873	165,773	165,606	164,976
NET EARNINGS PER SHARE:
Basic (in dollars per share)	$ 1.66	$ 1.44	$ 6.09	$ 3.29
Diluted (in dollars per share)	$ 1.63	$ 1.42	$ 5.99	$ 3.25
Used vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 6,435,590	$ 4,209,748	$ 18,697,300	$ 11,385,183
TOTAL COST OF SALES	5,927,237	3,791,134	17,085,416	10,223,875
Wholesale vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	1,922,283	828,362	4,998,212	1,990,296
TOTAL COST OF SALES	1,710,103	713,961	4,411,175	1,669,595
Total other sales and revenues
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	169,886	146,834	518,205	410,413
TOTAL COST OF SALES	$ 53,859	$ 48,419	$ 140,573	$ 154,666
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	90.20%	87.80%	89.40%	87.40%
GROSS PROFIT
Percentage of Sales
Item as a percent of net sales and operating revenues	9.80%	12.20%	10.60%	12.60%
CARMAX AUTO FINANCE INCOME
Percentage of Sales
Item as a percent of net sales and operating revenues	1.90%	3.40%	2.50%	2.70%
Selling, general and administrative expenses
Percentage of Sales
Item as a percent of net sales and operating revenues	6.80%	8.30%	7.00%	8.70%
Depreciation and Amortization, Nonproduction
Percentage of Sales
Item as a percent of net sales and operating revenues	0.60%	0.90%	0.60%	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	(0.10%)	0.00%	(0.10%)	0.00%
Earnings before income taxes
Percentage of Sales
Item as a percent of net sales and operating revenues	4.20%	6.00%	5.30%	5.10%
Income tax provision
Percentage of Sales
Item as a percent of net sales and operating revenues	1.00%	1.50%	1.20%	1.20%
NET EARNINGS
Percentage of Sales
Item as a percent of net sales and operating revenues	3.20%	4.50%	4.10%	3.90%
NET SALES AND OPERATING REVENUES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	75.50%	81.20%	77.20%	82.60%
NET SALES AND OPERATING REVENUES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	22.50%	16.00%	20.60%	14.40%
NET SALES AND OPERATING REVENUES | Total other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	2.00%	2.80%	2.10%	3.00%
TOTAL COST OF SALES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	69.50%	73.10%	70.60%	74.20%
TOTAL COST OF SALES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	20.10%	13.80%	18.20%	12.10%
TOTAL COST OF SALES | Total other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	0.60%	0.90%	0.60%	1.10%