Common Stock	12 Months Ended
Dec. 30, 2017
Common Stock
Common Stock	10. Common Stock Restricted Share Vesting. In fiscal 2017, fiscal 2016, and fiscal 2015, 211,320, 201,905, and 106,504 shares of restricted stock and restricted stock units vested, respectively. CRA redeemed 76,181, 69,000, and 28,900 of these shares from their holders in order to pay $3.3 million, $1.9 million, and $0.7 million, respectively, of employee tax withholdings. Common Stock Repurchases and Retirements. On March 21, 2016 and May 3, 2017, CRA announced that its board of directors approved share repurchase programs of up to $20.0 million and $20.0 million, respectively, of CRA's common stock. Repurchases under these programs are discretionary and CRA may make such repurchases 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 fiscal 2017, CRA repurchased and retired 554,708 shares under these share repurchase programs at an aggregate price of approximately $19.5 million, resulting in approximately $9.5 million available for future repurchases as of December 30, 2017. During fiscal 2016, CRA repurchased and retired 783,703 shares under these share repurchase programs at an aggregate price of approximately $19.1 million, resulting in approximately $9.0 million available for future repurchases as of December 31, 2016. During fiscal 2015, CRA repurchased and retired 477,292 shares under these share repurchase programs at an aggregate price of approximately $12.8 million, resulting in approximately $8.1 million available for future repurchases as of January 2, 2016. Tender Offer. During fiscal 2016, a total of 1,164 shares of common stock were tendered in conjunction with a modified "Dutch Auction" self tender offer at a purchase price of $19.75 per share. Exercise of Stock Options. During fiscal 2017, 293,439 options were exercised for $6.4 million of proceeds. During fiscal 2016, 124,931 options were exercised for $2.9 million of proceeds. During fiscal 2015, 29,288 options were exercised for $0.6 million of proceeds. Tax Benefits and Deficits on Stock Option Exercises and Restricted Share Vesting. During fiscal 2017, CRA recorded a net tax benefit on stock option exercises and the vesting of shares of restricted stock and restricted stock units through the income statement totaling $2.2 million. During fiscal 2016 and 2015, CRA recorded a net tax deficit on stock option exercises, expirations and the vesting of shares of restricted stock and restricted stock units, as a decrease to common stock totaling $0.2 million and $0.4 million, respectively.

10. Common Stock

Restricted Share Vesting. In fiscal 2017, fiscal 2016, and fiscal 2015, 211,320, 201,905, and 106,504 shares of restricted stock and restricted stock units vested, respectively. CRA redeemed 76,181, 69,000, and 28,900 of these shares from their holders in order to pay $3.3 million, $1.9 million, and $0.7 million, respectively, of employee tax withholdings.

Common Stock Repurchases and Retirements. On March 21, 2016 and May 3, 2017, CRA announced that its board of directors approved share repurchase programs of up to $20.0 million and $20.0 million, respectively, of CRA's common stock. Repurchases under these programs are discretionary and CRA may make such repurchases 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 fiscal 2017, CRA repurchased and retired 554,708 shares under these share repurchase programs at an aggregate price of approximately $19.5 million, resulting in approximately $9.5 million available for future repurchases as of December 30, 2017. During fiscal 2016, CRA repurchased and retired 783,703 shares under these share repurchase programs at an aggregate price of approximately $19.1 million, resulting in approximately $9.0 million available for future repurchases as of December 31, 2016. During fiscal 2015, CRA repurchased and retired 477,292 shares under these share repurchase programs at an aggregate price of approximately $12.8 million, resulting in approximately $8.1 million available for future repurchases as of January 2, 2016.

Tender Offer. During fiscal 2016, a total of 1,164 shares of common stock were tendered in conjunction with a modified "Dutch Auction" self tender offer at a purchase price of $19.75 per share.

Exercise of Stock Options. During fiscal 2017, 293,439 options were exercised for $6.4 million of proceeds. During fiscal 2016, 124,931 options were exercised for $2.9 million of proceeds. During fiscal 2015, 29,288 options were exercised for $0.6 million of proceeds.

Tax Benefits and Deficits on Stock Option Exercises and Restricted Share Vesting. During fiscal 2017, CRA recorded a net tax benefit on stock option exercises and the vesting of shares of restricted stock and restricted stock units through the income statement totaling $2.2 million. During fiscal 2016 and 2015, CRA recorded a net tax deficit on stock option exercises, expirations and the vesting of shares of restricted stock and restricted stock units, as a decrease to common stock totaling $0.2 million and $0.4 million, respectively.