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Summary of Significant Accounting Policies - GNU Interest (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 13, 2016 | Jan. 08, 2015 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Oct. 03, 2015 | Jul. 04, 2015 | Apr. 04, 2015 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015 | Apr. 13, 2017
GNU Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Notes Payable |  |  |  |  |  |  |  |  |  |  | $ 75 | $ 300 | $ 26 |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | 606 |  |
Net revenue |  |  | $ 79,569 | $ 81,691 | $ 82,607 | $ 80,912 | $ 72,460 | $ 76,525 | $ 76,535 | $ 78,039 | 324,779 | 303,559 | 306,371 |
Net income (loss) |  |  | 2,076 | 3,151 | 6,767 | 2,239 | (2,589) | 2,813 | 3,202 | 2,899 | 14,233 | 6,325 | 13,407 |
Net income attributable to CRA International, Inc |  |  | $ 2,058 | $ 3,193 | 5,215 | $ 2,423 | (1,307) | $ 2,860 | $ 3,325 | 2,779 | $ 12,888 | 7,657 | 13,638 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price receivable | $ 1,350 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price received | $ 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU | Future |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price receivable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250
GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |
GNU Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest held by the entity |  |  |  |  |  |  |  |  |  |  | 55.89% |  |  |
Notes Payable |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Notes Payable |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  | $ 600 |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  |  | $ 800 | 3,800 | 4,800 |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 3,000 | (3,000) | (500) |
Net income attributable to CRA International, Inc |  |  |  |  |  |  |  |  |  |  | $ 1,700 | $ 1,300 | $ 200 |
Goodwill and intangible asset impairment charges |  |  |  |  |  |  | $ 4,500 |  |  |  |  |  |  |
GNU | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of interest in subsidiaries |  |  |  |  | 3,800 |  |  |  |  |  |  |  |  |
CRA | Disposal Group, Disposed of by Sale, Not Discontinued Operations | GNU |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of GNU interest |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of interest in subsidiaries |  |  |  |  | $ 2,100 |  |  |  |  |  |  |  |  |

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