Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 12,574,299	$ 10,962,818	$ 10,003,599
Cost of sales	10,925,598	9,498,456	8,624,838
GROSS PROFIT	1,648,701	1,464,362	1,378,761
CARMAX AUTO FINANCE INCOME	336,167	299,267	262,185
Selling, general and administrative expenses	1,155,215	1,031,034	940,786
Interest expense	30,834	32,357	33,714
Other income (expense)	(1,497)	1,113	464
Earnings before income taxes	797,322	701,351	666,910
Income tax provision	304,736	267,067	253,115
NET EARNINGS	492,586	434,284	413,795
WEIGHTED AVERAGE COMMON SHARES:
Basic	223,589	228,095	226,282
Diluted	227,584	231,823	230,721
NET EARNINGS PER SHARE:
Basic	$ 2.20	$ 1.90	$ 1.83
Diluted	$ 2.16	$ 1.87	$ 1.79
Used Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
Used vehicle sales	10,306,256	8,746,965	7,826,911
Percentage of Sales
Item as a percent of net sales and operating revenues	82.00%	79.80%	78.20%
New Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
New vehicle sales	212,036	207,726	200,584
Percentage of Sales
Item as a percent of net sales and operating revenues	1.70%	1.90%	2.00%
Wholesale Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
Wholesale vehicle sales	1,823,425	1,759,555	1,721,647
Percentage of Sales
Item as a percent of net sales and operating revenues	14.50%	16.10%	17.20%
Other Sales And Revenues [Member]
SALES AND OPERATING REVENUES:
Other sales and revenues	$ 232,582	$ 248,572	$ 254,457
Percentage of Sales
Item as a percent of net sales and operating revenues	1.80%	2.30%	2.50%
Net Sales And Operating Revenues [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	100.00%	100.00%	100.00%
Cost Of Sales [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	86.90%	86.60%	86.20%
Gross Profit [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	13.10%	13.40%	13.80%
CAF Income [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	2.70%	2.70%	2.60%
Selling, General And Administrative Expenses [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	9.20%	9.40%	9.40%
Interest Expense [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	0.20%	0.30%	0.30%
Earnings Before Income Taxes [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	6.30%	6.40%	6.70%
Income Tax Provision [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	2.40%	2.40%	2.50%
Net Earnings [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	3.90%	4.00%	4.10%