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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
CRA International, Inc. Shareholders' Equity
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interest
Total
BALANCE at Jan. 03, 2015 $ 214,085 $ 73,171 $ 147,618 $ (6,704) $ 619 $ 214,704
BALANCE (in shares) at Jan. 03, 2015   9,228,272        
Increase (Decrease) in Shareholders' Equity            
Net income (loss) 7,657   7,657   (1,332) 6,325
Foreign currency translation adjustment (2,546)     (2,546)   (2,546)
Issuance of common stock 42 $ 42       42
Issuance of common stock (in shares)   1,359        
Exercise of stock options 602 $ 602       $ 602
Exercise of stock options (in shares)   29,288       29,288
Share-based compensation expense for employees 5,755 $ 5,755       $ 5,755
Restricted shares vesting (in shares)   106,504        
Redemption of vested employee restricted shares for tax withholding (668) $ (668)       (668)
Redemption of vested employee restricted shares for tax withholding (in shares)   (28,900)        
Tax deficit on stock option exercises, expirations and restricted share vesting (376) $ (376)       (376)
Shares repurchased (12,806) $ (12,806)       $ (12,806)
Shares repurchased (in shares)   (477,292)       (477,292)
Share-based compensation expense for non-employees 11 $ 11       $ 11
Equity transactions of noncontrolling interest         25 25
BALANCE at Jan. 02, 2016 211,756 $ 65,731 155,275 (9,250) (688) 211,068
BALANCE (in shares) at Jan. 02, 2016   8,859,231        
Increase (Decrease) in Shareholders' Equity            
Net income (loss) 12,888   12,888   1,345 14,233
Foreign currency translation adjustment (4,568)     (4,568)   (4,568)
Issuance of common stock 44 $ 44       44
Issuance of common stock (in shares)   1,790        
Exercise of stock options 2,853 $ 2,853       $ 2,853
Exercise of stock options (in shares)   124,931       124,931
Share-based compensation expense for employees 6,716 $ 6,716       $ 6,716
Restricted shares vesting (in shares)   201,905        
Redemption of vested employee restricted shares for tax withholding (1,880) $ (1,880)       (1,880)
Redemption of vested employee restricted shares for tax withholding (in shares)   (69,000)        
Tax deficit on stock option exercises, expirations and restricted share vesting (171) $ (171)       (171)
Shares repurchased (19,315) $ (19,315)       $ (19,315)
Shares repurchased (in shares)   (784,867)       (783,703)
Share-based compensation expense for non-employees 146 $ 146       $ 146
Accrued dividends on unvested shares (83)   (83)     (83)
Cash dividends paid to stockholders (1,166)   (1,166)     (1,166)
Equity transactions of noncontrolling interest         6 6
BALANCE at Dec. 31, 2016 207,220 $ 54,124 166,914 (13,818) 663 $ 207,883
BALANCE (in shares) at Dec. 31, 2016   8,333,990       8,333,990
Increase (Decrease) in Shareholders' Equity            
Net income (loss) 7,624   7,624   77 $ 7,701
Foreign currency translation adjustment 3,922     3,922   3,922
Issuance of common stock 3,044 $ 3,044       3,044
Issuance of common stock (in shares)   89,312        
Exercise of stock options 6,420 $ 6,420       $ 6,420
Exercise of stock options (in shares)   293,439       293,439
Share-based compensation expense for employees 6,489 $ 6,489       $ 6,489
Restricted shares vesting (in shares)   211,320        
Redemption of vested employee restricted shares for tax withholding (3,262) $ (3,262)       (3,262)
Redemption of vested employee restricted shares for tax withholding (in shares)   (76,181)        
Cumulative effect of a change in accounting principle related to ASU 2016-09 48   48     48
Shares repurchased (19,528) $ (19,528)       $ (19,528)
Shares repurchased (in shares)   (554,708)       (554,708)
Share-based compensation expense for non-employees 127 $ 127       $ 127
Distribution to noncontrolling interest         (419) (419)
Accrued dividends on unvested shares (134)   (134)     (134)
Cash paid on dividend equivalents (121)   (121)     (121)
Cash dividends paid to stockholders (4,941)   (4,941)     (4,941)
BALANCE at Dec. 30, 2017 $ 206,908 $ 47,414 $ 169,390 $ (9,896) $ 321 $ 207,229
BALANCE (in shares) at Dec. 30, 2017   8,297,172       8,297,172