The following table summarizes the components of stock-based compensation expense recognized in the Company’s consolidated statements of income for the periods indicated:

	Three Months Ended October 31,				Six Months Ended October 31,
	2018		2017		2018		2017
	(in thousands)
Restricted stock	$	6,301	$	5,309	$	11,670	$	9,714
ESPP		354		278		699		569
Total stock-based compensation expense	$	6,655	$	5,587	$	12,369	$	10,283

At the Company’s 2016 Annual Meeting of Stockholders, held on October 6, 2016, the Company’s stockholders approved an amendment and restatement to the Korn/Ferry International Amended and Restated 2008 Stock Incentive Plan (the 2016 amendment and restatement being “The Third A&R 2008 Plan”), which among other things, increased the number of shares under the plan by 5,500,000 shares, increasing the current maximum number of shares that may be issued under the plan to 11,200,000 shares, subject to certain changes in the Company’s capital structure and other extraordinary events. The Third A&R 2008 Plan provides for the grant of awards to eligible participants, designated as either nonqualified or incentive stock options, restricted stock and restricted stock units, any of which may be performance-based or market-based, and incentive bonuses, which may be paid in cash or stock or a combination thereof. Under the Third A&R 2008 Plan, the ability to issue full-value awards is limited by requiring full-value stock awards to count 2.3 times as much as stock options.

The Company grants time-based restricted stock awards to executive officers and other senior employees generally vesting over a four-year period. In addition, certain key management members typically receive time-based restricted stock awards upon commencement of employment and may receive them annually in conjunction with the Company’s performance review. Time-based restricted stock awards are granted at a price equal to fair value, which is determined based on the closing price of the Company’s common stock on the grant date. The Company recognizes compensation expense for time-based restricted stock awards on a straight-line basis over the vesting period.

The Company also grants market-based and performance-based restricted stock units to executive officers and other senior employees. The market-based units vest after three years depending upon the Company’s total stockholder return over the three-year performance period relative to other companies in its selected peer group. The fair value of these market-based restricted stock units are determined by using extensive market data that is based on historical Company and peer group information. The Company recognizes compensation expense for market-based restricted stock units on a straight-line basis over the vesting period.

Performance-based restricted stock units vest after three years depending upon the Company meeting certain objectives that are set at the time the restricted stock unit is issued. Performance-based restricted stock units are granted at a price equal to the fair value, which is determined based on the closing price of the Company’s common stock on the grant date. At the end of each reporting period, the Company estimates the number of restricted stock units expected to vest, based on the probability that certain performance objectives will be met, exceeded, or fall below target levels, and the Company takes into account these estimates when calculating the expense for the period.

Restricted stock activity during the six months ended October 31, 2018 is summarized below:

	Shares			Weighted- Average Grant Date Fair Value
	(in thousands, except per share data)
Non-vested, April 30, 2018		1,730		$	33.45
Granted		515		$	52.81
Vested		(572	)	$	34.16
Forfeited/expired		(25	)	$	32.26
Non-vested, October 31, 2018		1,648		$	42.22

As of October 31, 2018, there were 0.6 million shares and 0.2 million shares outstanding relating to market-based and performance-based restricted stock units, respectively, with total unrecognized compensation totaling $14.8 million and $0.4 million, respectively.

As of October 31, 2018, there was $45.5 million of total unrecognized compensation cost related to all non-vested awards of restricted stock, which is expected to be recognized over a weighted-average period of 2.7 years. During the three and six months ended October 31, 2018, 2,708 shares and 202,503 shares of restricted stock totaling $0.1 million and $13.2 million, respectively, were repurchased by the Company, at the option of the employee, to pay for taxes related to vesting of restricted stock. During the three and six months ended October 31, 2017, 2,888 shares and 100,371 shares of restricted stock totaling $0.1 million and $3.4 million, respectively, were repurchased by the Company, at the option of employees, to pay for taxes related to vesting of restricted stock.

The Company has an ESPP that, in accordance with Section 423 of the Internal Revenue Code, allows eligible employees to authorize payroll deductions of up to 15% of their salary to purchase shares of the Company’s common stock at 85% of the fair market price of the common stock on the last day of the enrollment period. Employees may not purchase more than $25,000 in stock during any calendar year. The maximum number of shares that may be issued under the ESPP is 3.0 million shares. During the three months ended October 31, 2018 and 2017, no shares were purchased under the ESPP. During the six months ended October 31, 2018 and 2017, employees purchased 75,106 shares at $52.64 per share and 116,285 shares at $29.35 per share, respectively. As of October 31, 2018, the ESPP had approximately 1.0 million shares remaining available for future issuance.

During the six months ended October 31, 2018 and 2017, the Company issued 6,720 shares and 41,075 shares of common stock, respectively, because of the exercise of stock options, with cash proceeds from the exercise of $0.2 million and $0.6 million, respectively. No stock options were exercised during the three months ended October 31, 2018 and 2017.

During the three and six months ended October 31, 2018, the Company repurchased (on the open market) 456,274 shares of the Company’s common stock for $22.7 million. During the three and six months ended October 31, 2017, the Company repurchased (on the open market) 773,923 shares and 893,279 shares of the Company’s common stock for $25.3 million and $29.3 million, respectively.