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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect Period of Adoption, Adjustment | Cumulative Effect Period of Adoption, Adjusted Balance | CRA International, Inc. Shareholders' Equity | CRA International, Inc. Shareholders' Equity Cumulative Effect Period of Adoption, Adjustment | CRA International, Inc. Shareholders' Equity Cumulative Effect Period of Adoption, Adjusted Balance | Common Stock | Common Stock Cumulative Effect Period of Adoption, Adjusted Balance | Retained Earnings | Retained Earnings Cumulative Effect Period of Adoption, Adjustment | Retained Earnings Cumulative Effect Period of Adoption, Adjusted Balance | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Cumulative Effect Period of Adoption, Adjusted Balance | Noncontrolling Interest | Noncontrolling Interest Cumulative Effect Period of Adoption, Adjusted Balance
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 30, 2017 | $ 207,229 |  | $ 207,595 | $ 206,908 |  | $ 207,274 | $ 47,414 | $ 47,414 | $ 169,390 |  | $ 169,756 | $ (9,896) | $ (9,896) | $ 321 | $ 321
BALANCE (ASC 606) at Dec. 30, 2017 |  | $ 366 |  |  | $ 366 |  |  |  |  | $ 366 |  |  |  |  |
BALANCE (in shares) at Dec. 30, 2017 |  |  |  |  |  |  | 8,297,172 | 8,297,172 |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 22,472 |  |  | 22,492 |  |  |  |  | 22,492 |  |  |  |  | (20) |
Foreign currency translation adjustment | (2,698) |  |  | (2,698) |  |  |  |  |  |  |  | (2,698) |  |  |
Exercise of stock options | 2,166 |  |  | 2,166 |  |  | $ 2,166 |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  |  |  |  | 100,771 |  |  |  |  |  |  |  |
Share-based compensation expense for employees and non-employees | 4,819 |  |  | 4,819 |  |  | $ 4,819 |  |  |  |  |  |  |  |
Restricted shares vesting (in shares) |  |  |  |  |  |  | 237,509 |  |  |  |  |  |  |  |
Redemption of vested employee restricted shares for tax withholding | (3,946) |  |  | (3,946) |  |  | $ (3,946) |  |  |  |  |  |  |  |
Redemption of vested employee restricted shares for tax withholding (in shares) |  |  |  |  |  |  | (83,341) |  |  |  |  |  |  |  |
Shares repurchased | (27,616) |  |  | (27,616) |  |  | $ (27,616) |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  | (541,631) |  |  |  |  |  |  |  |
GNU gain on liquidation | (258) |  |  |  |  |  |  |  |  |  |  |  |  | (258) |
Distribution to noncontrolling interest | (43) |  |  |  |  |  |  |  |  |  |  |  |  | (43) |
Accrued dividends on unvested shares | 21 |  |  | 21 |  |  |  |  | 21 |  |  |  |  |  |
Cash paid on dividend equivalents | (256) |  |  | (256) |  |  |  |  | (256) |  |  |  |  |  |
Cash dividends paid to shareholders | (5,784) |  |  | (5,784) |  |  |  |  | (5,784) |  |  |  |  |  |
BALANCE at Dec. 29, 2018 | 196,472 |  |  | 196,472 |  |  | $ 22,837 |  | 186,229 |  |  | (12,594) |  | 0 |
BALANCE (in shares) at Dec. 29, 2018 |  |  |  |  |  |  | 8,010,480 |  |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 20,747 |  |  | 20,747 |  |  |  |  | 20,747 |  |  |  |  |  |
Foreign currency translation adjustment | 831 |  |  | 831 |  |  |  |  |  |  |  | 831 |  |  |
Exercise of stock options | 3,211 |  |  | 3,211 |  |  | $ 3,211 |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  |  |  |  | 140,513 |  |  |  |  |  |  |  |
Share-based compensation expense for employees | 3,461 |  |  | 3,461 |  |  | $ 3,461 |  |  |  |  |  |  |  |
Restricted shares vesting (in shares) |  |  |  |  |  |  | 128,089 |  |  |  |  |  |  |  |
Redemption of vested employee restricted shares for tax withholding | (2,176) |  |  | (2,176) |  |  | $ (2,176) |  |  |  |  |  |  |  |
Redemption of vested employee restricted shares for tax withholding (in shares) |  |  |  |  |  |  | (43,173) |  |  |  |  |  |  |  |
Shares repurchased | (18,068) |  |  | (18,068) |  |  | $ (18,068) |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  | (421,112) |  |  |  |  |  |  |  |
Accrued dividends on unvested shares | 58 |  |  | 58 |  |  |  |  | 58 |  |  |  |  |  |
Cash paid on dividend equivalents | (246) |  |  | (246) |  |  |  |  | (246) |  |  |  |  |  |
Cash dividends paid to shareholders | (6,539) |  |  | (6,539) |  |  |  |  | (6,539) |  |  |  |  |  |
BALANCE at Dec. 28, 2019 | $ 197,751 |  | $ 197,548 | 197,751 |  | $ 197,548 | $ 9,265 | $ 9,265 | 200,249 |  | $ 200,046 | (11,763) | $ (11,763) | 0 | $ 0
BALANCE (ASC 326) at Dec. 28, 2019 |  | $ (203) |  |  | $ (203) |  |  |  |  | $ (203) |  |  |  |  |
BALANCE (in shares) at Dec. 28, 2019 | 7,814,797 |  |  |  |  |  | 7,814,797 | 7,814,797 |  |  |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 24,507 |  |  | 24,507 |  |  |  |  | 24,507 |  |  |  |  |  |
Foreign currency translation adjustment | 3,280 |  |  | 3,280 |  |  |  |  |  |  |  | 3,280 |  |  |
Exercise of stock options | 2,236 |  |  | 2,236 |  |  | $ 2,236 |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  |  |  |  | 118,841 |  |  |  |  |  |  |  |
Share-based compensation expense for employees | 3,235 |  |  | 3,235 |  |  | $ 3,235 |  |  |  |  |  |  |  |
Restricted shares vesting (in shares) |  |  |  |  |  |  | 61,396 |  |  |  |  |  |  |  |
Redemption of vested employee restricted shares for tax withholding | (862) |  |  | (862) |  |  | $ (862) |  |  |  |  |  |  |  |
Redemption of vested employee restricted shares for tax withholding (in shares) |  |  |  |  |  |  | (17,695) |  |  |  |  |  |  |  |
Shares repurchased | (13,371) |  |  | (13,371) |  |  | $ (13,371) |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  | (283,842) |  |  |  |  |  |  |  |
Accrued dividends on unvested shares | (51) |  |  | (51) |  |  |  |  | (51) |  |  |  |  |  |
Cash paid on dividend equivalents | (108) |  |  | (108) |  |  |  |  | (108) |  |  |  |  |  |
Cash dividends paid to shareholders | (7,395) |  |  | (7,395) |  |  |  |  | (7,395) |  |  |  |  |  |
BALANCE at Jan. 02, 2021 | $ 209,019 |  |  | $ 209,019 |  |  | $ 503 |  | $ 216,999 |  |  | $ (8,483) |  | $ 0 |
BALANCE (in shares) at Jan. 02, 2021 | 7,693,497 |  |  |  |  |  | 7,693,497 |  |  |  |  |  |  |  |

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