Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Aug. 31, 2012		Aug. 31, 2011		Aug. 31, 2012		Aug. 31, 2011
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 2,758,004		$ 2,587,819	[1]	$ 5,532,424		$ 5,267,236	[1]
Cost of sales	2,390,011		2,233,544	[1]	4,782,516		4,529,866	[1]
GROSS PROFIT	367,993		354,275	[1]	749,908		737,370	[1]
CARMAX AUTO FINANCE INCOME	75,676		63,826	[1]	150,855		133,487	[1]
Selling, general and administrative expenses	254,674		229,887	[1]	508,277		471,542	[1]
Interest expense	8,152		8,464	[1]	16,295		17,004	[1]
Other income	259		110	[1]	544		213	[1]
Earnings before income taxes	181,102		179,860	[1]	376,735		382,524	[1]
Income tax provision	69,466		68,706	[1]	144,353		145,870	[1]
NET EARNINGS	111,636		111,154	[1],[2]	232,382		236,654	[1],[2]
WEIGHTED AVERAGE COMMON SHARES:
Basic	228,366		226,300	[1],[2]	228,069		225,935	[1],[2]
Diluted	231,696		230,681	[1],[2]	231,749		230,479	[1],[2]
NET EARNINGS PER SHARE:
Basic	$ 0.49		$ 0.49	[1],[2]	$ 1.02		$ 1.05	[1],[2]
Diluted	$ 0.48		$ 0.48	[1],[2]	$ 1.00		$ 1.03	[1],[2]
Used Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	2,191,964		2,014,983	[1]	4,380,871		4,086,523	[1]
Percentage of Sales
Item as a percent of net sales and operating revenues	79.50%	[3]	77.90%	[3]	79.20%	[3]	77.60%	[3]
New Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	61,393		46,853	[1]	116,850		108,739	[1]
Percentage of Sales
Item as a percent of net sales and operating revenues	2.20%	[3]	1.80%	[3]	2.10%	[3]	2.10%	[3]
Wholesale Vehicle Sales [Member]
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	437,050		457,870	[1]	904,845		935,664	[1]
Percentage of Sales
Item as a percent of net sales and operating revenues	15.80%	[3]	17.70%	[3]	16.40%	[3]	17.80%	[3]
Other Sales And Revenues [Member]
SALES AND OPERATING REVENUES:
NET SALES AND OPERATING REVENUES	$ 67,597		$ 68,113	[1]	$ 129,858		$ 136,310	[1]
Percentage of Sales
Item as a percent of net sales and operating revenues	2.50%	[3]	2.60%	[3]	2.30%	[3]	2.60%	[3]
Net Sales And Operating Revenues [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	100.00%	[3]	100.00%	[3]	100.00%	[3]	100.00%	[3]
Cost Of Sales [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	86.70%	[3]	86.30%	[3]	86.40%	[3]	86.00%	[3]
Gross Profit [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	13.30%	[3]	13.70%	[3]	13.60%	[3]	14.00%	[3]
Net Income From Financing [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	2.70%	[3]	2.50%	[3]	2.70%	[3]	2.50%	[3]
Selling, General And Administrative Expenses [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	9.20%	[3]	8.90%	[3]	9.20%	[3]	9.00%	[3]
Interest Expense [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	0.30%	[3]	0.30%	[3]	0.30%	[3]	0.30%	[3]
Other Income (Expense) [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	0.00%	[3]	0.00%	[3]	0.00%	[3]	0.00%	[3]
Earnings Before Income Taxes [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	6.60%	[3]	7.00%	[3]	6.80%	[3]	7.30%	[3]
Income Tax Provision [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	2.50%	[3]	2.70%	[3]	2.60%	[3]	2.80%	[3]
Net Earnings [Member]
Percentage of Sales
Item as a percent of net sales and operating revenues	4.00%	[3]	4.30%	[3]	4.20%	[3]	4.50%	[3]

[1] As discussed in Note 2, fiscal 2012 reflects the revisions to correct our accounting for sale-leaseback transactions.

[2] (1) As discussed in Note 2, fiscal 2012 reflects the revisions to correct our accounting for sale-leaseback transactions.

[3] Percents are calculated as a percentage of net sales and operating revenues and may not equal totals due to rounding.