Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Nov. 30, 2013		Nov. 30, 2012		Nov. 30, 2013		Nov. 30, 2012
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 2,941,407		$ 2,602,446		$ 9,498,016		$ 8,134,870
Cost of sales	2,559,686		2,257,227		8,233,456		7,039,743
GROSS PROFIT	381,721		345,219		1,264,560		1,095,127
CARMAX AUTO FINANCE INCOME	83,905		72,454		255,346		223,309
Selling, general and administrative expenses	284,366		257,282		857,761		765,559
Interest expense	7,649		8,065		23,288		24,360
Other (loss) income	(411)		139		(1,243)		683
Earnings before income taxes	173,200		152,465		637,614		529,200
Income tax provision	66,748		57,784		244,237		202,137
NET EARNINGS	106,452		94,681		393,377		327,063
WEIGHTED AVERAGE COMMON SHARES:
Basic	223,259		228,904		223,831		228,346
Diluted	227,417		232,656		227,870		232,048
NET EARNINGS PER SHARE:
Basic	$ 0.48		$ 0.41		$ 1.76		$ 1.43
Diluted	$ 0.47		$ 0.41		$ 1.73		$ 1.41
Used Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	2,396,840		2,068,742		7,738,118		6,449,613
Percentage of Sales
Item as a percent of net sales and operating revenues	81.50%	[1]	79.50%	[1]	81.50%	[1]	79.30%	[1]
New Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	50,073		45,693		162,502		162,543
Percentage of Sales
Item as a percent of net sales and operating revenues	1.70%	[1]	1.80%	[1]	1.70%	[1]	2.00%	[1]
Wholesale Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	437,272		427,650		1,402,838		1,332,495
Percentage of Sales
Item as a percent of net sales and operating revenues	14.90%	[1]	16.40%	[1]	14.80%	[1]	16.40%	[1]
Other Sales And Revenues [Member]
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 57,222		$ 60,361		$ 194,558		$ 190,219
Percentage of Sales
Item as a percent of net sales and operating revenues	1.90%	[1]	2.30%	[1]	2.00%	[1]	2.30%	[1]
Net Sales And Operating Revenues [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	100.00%	[1]	100.00%	[1]	100.00%	[1]	100.00%	[1]
Cost Of Sales [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	87.00%	[1]	86.70%	[1]	86.70%	[1]	86.50%	[1]
Gross Profit [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	13.00%	[1]	13.30%	[1]	13.30%	[1]	13.50%	[1]
CAF Income [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	2.90%	[1]	2.80%	[1]	2.70%	[1]	2.70%	[1]
Selling, General And Administrative Expenses [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	9.70%	[1]	9.90%	[1]	9.00%	[1]	9.40%	[1]
Interest Expense [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	0.30%	[1]	0.30%	[1]	0.20%	[1]	0.30%	[1]
Other Loss Income [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	0.00%	[1]	0.00%	[1]	0.00%	[1]	0.00%	[1]
Earnings Before Income Taxes [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	5.90%	[1]	5.90%	[1]	6.70%	[1]	6.50%	[1]
Income Tax Provision [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	2.30%	[1]	2.20%	[1]	2.60%	[1]	2.50%	[1]
Net Earnings [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	3.60%	[1]	3.60%	[1]	4.10%	[1]	4.00%	[1]

[1] Calculated as a percentage of net sales and operating revenues and may not equal totals due to rounding.