Consolidated Statements Of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 4,790,028	$ 4,295,871	$ 15,357,497	$ 13,854,498
TOTAL COST OF SALES	4,176,381	3,726,634	13,308,014	11,973,285
GROSS PROFIT	613,647	569,237	2,049,483	1,881,213
CARMAX AUTO FINANCE INCOME	114,033	109,725	344,123	334,985
Selling, general and administrative expenses	484,848	409,520	1,455,339	1,301,308
Interest expense	21,843	18,814	60,700	54,816
Other (income) expense	(6,570)	2,820	(6,786)	3,097
Earnings before income taxes	227,559	247,808	884,353	856,977
Income tax provision	54,403	57,497	210,854	207,120
NET EARNINGS	$ 173,156	$ 190,311	$ 673,499	$ 649,857
WEIGHTED AVERAGE COMMON SHARES:
Basic, shares	164,273	173,816	165,321	176,088
Diluted, shares	166,534	175,321	167,154	177,656
NET EARNINGS PER SHARE:
Basic (in dollars per share)	$ 1.05	$ 1.09	$ 4.07	$ 3.69
Diluted (in dollars per share)	$ 1.04	$ 1.09	$ 4.03	$ 3.66
Used vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 4,028,811	$ 3,547,925	$ 12,915,763	$ 11,544,340
TOTAL COST OF SALES	3,615,704	3,177,953	11,549,445	10,305,945
Wholesale vehicle sales
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	610,983	603,584	1,951,718	1,849,225
TOTAL COST OF SALES	504,177	498,840	1,601,573	1,518,698
Total other sales and revenues
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	150,234	144,362	490,016	460,933
TOTAL COST OF SALES	$ 56,500	$ 49,841	$ 156,996	$ 148,642
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	87.20%	86.70%	86.70%	86.40%
GROSS PROFIT
Percentage of Sales
Item as a percent of net sales and operating revenues	12.80%	13.30%	13.30%	13.60%
CARMAX AUTO FINANCE INCOME
Percentage of Sales
Item as a percent of net sales and operating revenues	2.40%	2.60%	2.20%	2.40%
Selling, general and administrative expenses
Percentage of Sales
Item as a percent of net sales and operating revenues	10.10%	9.50%	9.50%	9.40%
Interest expense
Percentage of Sales
Item as a percent of net sales and operating revenues	0.50%	0.40%	0.40%	0.40%
Other (income) expense
Percentage of Sales
Item as a percent of net sales and operating revenues	(0.10%)	0.10%	0.00%	0.00%
Earnings before income taxes
Percentage of Sales
Item as a percent of net sales and operating revenues	4.80%	5.80%	5.80%	6.20%
Income tax provision
Percentage of Sales
Item as a percent of net sales and operating revenues	1.10%	1.30%	1.40%	1.50%
NET EARNINGS
Percentage of Sales
Item as a percent of net sales and operating revenues	3.60%	4.40%	4.40%	4.70%
NET SALES AND OPERATING REVENUES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	84.10%	82.60%	84.10%	83.30%
NET SALES AND OPERATING REVENUES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	12.80%	14.10%	12.70%	13.30%
NET SALES AND OPERATING REVENUES | Total other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	3.10%	3.40%	3.20%	3.30%
TOTAL COST OF SALES | Used vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	75.50%	74.00%	75.20%	74.40%
TOTAL COST OF SALES | Wholesale vehicle sales
Percentage of Sales
Item as a percent of net sales and operating revenues	10.50%	11.60%	10.40%	11.00%
TOTAL COST OF SALES | Total other sales and revenues
Percentage of Sales
Item as a percent of net sales and operating revenues	1.20%	1.20%	1.00%	1.10%