Stock-Based Compensation and Share Repurchases

The Company recognized stock-based compensation expense within selling, general and administrative expense as follows (in thousands):



	Three months ended				Six months ended
	February 28, 2019		February 28, 2018		February 28, 2019		February 28, 2018
Restricted stock units and stock appreciation rights	$	13,604	$	12,952	$	28,655	$	56,459
Employee stock purchase plan	2,093		2,087		4,291		3,787
Other⁽¹⁾	—		—		—		7,538
Total	$	15,697	$	15,039	$	32,946	$	67,784


⁽¹⁾	Represents a one-time cash-settled stock award that vested on November 30, 2017.

As of February 28, 2019, the shares available to be issued under the 2011 Stock Award and Incentive Plan were 11,933,647.

Restricted Stock Units

Certain key employees have been granted time-based, performance-based and market-based restricted stock units. The time-based restricted stock units generally vest on a graded vesting schedule over three years. The performance-based restricted stock units generally vest on a cliff vesting schedule over three years and up to a maximum of 150%, depending on the specified performance condition and the level of achievement obtained. The performance-based restricted stock units have a vesting condition that is based upon the Company’s cumulative adjusted core earnings per share during the performance period. The market-based restricted stock units generally vest on a cliff vesting schedule over three years and up to a maximum of 200%, depending on the specified performance condition and the level of achievement obtained. The market-based restricted stock units have a vesting condition that is tied to the Company’s total shareholder return based on the Company’s stock performance in relation to the companies in the Standard and Poor’s (S&P) Super Composite Technology Hardware and Equipment Index excluding the Company. During the six months ended February 28, 2019 and 2018, the Company awarded approximately 1.6 million and 1.4 million time-based restricted stock units, respectively, 0.4 million and 0.4 million performance-based restricted stock units, respectively and 0.4 million and 0.4 million market-based restricted stock units, respectively.

The following represents the stock-based compensation information for the period indicated (in thousands):



	Six months ended
	February 28, 2019
Unrecognized stock-based compensation expense—restricted stock units	$	66,046
Remaining weighted-average period for restricted stock units expense	1.5 years

Common Stock Outstanding

The following represents the common stock outstanding for the periods indicated:



	Three months ended				Six months ended
	February 28, 2019		February 28, 2018		February 28, 2019		February 28, 2018
Common stock outstanding:
Beginning balances	157,986,896		176,305,660		164,588,172		177,727,653
Shares issued upon exercise of stock options	11,348		154		11,348		29,688
Shares issued under employee stock purchase plan	691,971		575,516		692,325		575,516
Vesting of restricted stock	219,764		220,022		1,905,927		2,694,147
Purchases of treasury stock under employee stock plans	(57,389	)	(59,708	)	(464,836	)	(784,031	)
Treasury shares purchased	(5,974,261	)	(4,978,414	)	(13,854,607	)	(8,179,743	)
Ending balances	152,878,329		172,063,230		152,878,329		172,063,230

Share Repurchases

In June 2018, the Company’s Board of Directors authorized the repurchase of up to $350.0 million of the Company’s common stock (the “2018 Share Repurchase Program”). The 2018 Share Repurchase Program expires August 31, 2019. As of February 28, 2019, 13.9 million shares had been repurchased for $350.0 million, which utilized the total amount authorized by the Board of Directors.