Stock and Stock-Based Incentive Plans (Tables)

9 Months Ended

Nov. 30, 2019

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Common Stock Repurchases

Common Stock Repurchases

	Three Months Ended				Nine Months Ended
	November 30				November 30
	2019		2018		2019		2018
Number of shares repurchased (in thousands)	1,270.3		3,657.8		5,748.9		9,257.1
Average cost per share	$	90.38	$	69.52	$	77.92	$	68.36
Available for repurchase, as of end of period (in millions)	$	1,666.0	$	2,384.0	$	1,666.0	$	2,384.0

Composition of Share-Based Compensation Expense

Composition of Share-Based Compensation Expense

	Three Months Ended					Nine Months Ended
	November 30					November 30
(In thousands)	2019		2018			2019		2018
Cost of sales	$	2,128	$	(343	)	$	6,293	$	2,551
CarMax Auto Finance income	1,317		596			4,166		3,030
Selling, general and administrative expenses	26,251		7,275			89,047		57,027
Share-based compensation expense, before income taxes	$	29,696	$	7,528		$	99,506	$	62,608

Composition Of Share-Based Compensation Expense - By Grant Type

Composition of Share-Based Compensation Expense – By Grant Type

	Three Months Ended						Nine Months Ended
	November 30						November 30
(In thousands)	2019			2018			2019		2018
Nonqualified stock options	$	6,151		$	6,230		$	24,314	$	23,838
Cash-settled restricted stock units (RSUs)	20,545			(2,485		)	59,763		25,409
Stock-settled market stock units (MSUs)	2,837			2,681			10,298		9,960
Other share-based incentives:
Stock-settled performance stock units (PSUs)	(244		)	317			1,389		1,043
Restricted stock (RSAs)	—			—			—		433
Stock-settled deferred stock units (DSUs)	—			426			2,412		720
Employee stock purchase plan	407			359			1,330		1,205
Total other share-based incentives	$	163		$	1,102		$	5,131	$	3,401
Share-based compensation expense, before income taxes	$	29,696		$	7,528		$	99,506	$	62,608

Share-based Payment Arrangement, Activity [Table Text Block]

	Nine Months Ended November 30, 2019
	Equity Classified									Liability Classified
(Shares/units in thousands)	Options			MSUs			Other			RSUs
Outstanding as of February 28, 2019	7,869			509			164			1,609
Granted	1,595			131			83			562
Exercised or vested and converted	(1,913		)	(150		)	(81		)	(504		)
Cancelled	(16		)	(5		)	—			(89		)
Outstanding as of November 30, 2019	7,535			485			166			1,578
Weighted average grant date fair value per share/unit:
Granted	$	22.10		$	98.63		$	80.55		$	78.61
Ending outstanding	$	18.16		$	84.02		$	70.97		$	66.85
	As of November 30, 2019
Unrecognized compensation (in millions)	$	47.0		$	15.6		$	3.1