15. Net Income per Share

CRA calculates basic and diluted earnings per common share using the two-class method. Under the two-class method, net earnings are allocated to each class of common stock and participating security as if all the net earnings for the period had been distributed. CRA's participating securities consist of unvested share-based payment awards that contain a nonforfeitable right to receive dividends and therefore are considered to participate in undistributed earnings with common shareholders. Basic earnings per common share excludes dilution and is calculated by dividing net earnings allocable to common shares by the weighted-average number of common shares outstanding for the period. Diluted earnings per common share is calculated by dividing net earnings allocable to common shares by the weighted-average number of common shares as of the balance sheet date, as adjusted for the potential dilutive effect of non-participating share-based awards. Net earnings allocable to participating securities were not significant for the second quarter of fiscal 2018 and fiscal 2017.

The following table presents a reconciliation from net income attributable to CRA International, Inc. to net income available to common shareholders (in thousands):

	Quarter Ended				Fiscal Year-to-Date Period Ended
	June 30, 2018		July 1, 2017		June 30, 2018		July 1, 2017
Net income, as reported	$	6,839	$	3,813	$	11,725	$	6,666
Less: net income attributable to participating shares		39		24		69		44

Net income available to common shareholders	$	6,800	$	3,789	$	11,656	$	6,622

The following table presents a reconciliation of basic to diluted weighted average shares of common stock outstanding (in thousands):

	Quarter Ended				Fiscal Year-to-Date Period Ended
	June 30, 2018		July 1, 2017		June 30, 2018		July 1, 2017
Basic weighted average shares outstanding		8,053		8,428		8,169		8,423
Stock options and restricted stock units		497		190		480		196

Diluted weighted average shares outstanding		8,550		8,618		8,649		8,619

For the fiscal quarter and fiscal year-to-date period ended June 30, 2018, the anti-dilutive share based awards that were excluded from the calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding amounted to 22,757 and 11,379 shares, respectively. For the fiscal quarter and fiscal year-to-date period ended July 1, 2017, the anti-dilutive share based awards that were excluded from the calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding amounted to 192,504 and 56,360 shares, respectively. These share-based awards were anti-dilutive because their exercise price exceeded the average market price over the respective period.

On May 3, 2017 and February 15, 2018, CRA announced its Board of Directors authorized the repurchase of up to an additional $20.0 million and $20.0 million, respectively, of CRA's common stock. Repurchases under these programs are discretionary and CRA may make such purchases under any of these programs in the open market (including under any Rule 10b5-1 plan adopted by CRA) or in privately negotiated transactions, in each case in accordance with applicable insider trading and other securities laws and regulations. CRA records the retirement of its repurchased shares as a reduction to common stock. During the fiscal quarter and fiscal year-to-date period ended June 30, 2018, CRA repurchased and retired 215,585 shares and 378,477 shares, respectively, under these share repurchase programs at an average price per share of $55.99 and $53.90, respectively. During the fiscal quarter and fiscal year-to-date period ended July 1, 2017, there were 389,079 shares repurchased and retired under these share repurchase programs at an average price per share of $34.63. As of June 30, 2018, there was approximately $9.1 million available for future repurchases under these programs.