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Summary of Significant Accounting Policies - Consolidation and Fiscal Year (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 16, 2016 USD ($) | Jan. 08, 2015 USD ($) | Jan. 02, 2016 USD ($) | Oct. 03, 2015 USD ($) | Jul. 04, 2015 USD ($) | Apr. 04, 2015 USD ($) | Jan. 03, 2015 USD ($) | Sep. 27, 2014 USD ($) | Jun. 28, 2014 USD ($) | Mar. 29, 2014 USD ($) | Jan. 02, 2016 USD ($) segment item | Jan. 03, 2015 USD ($) item | Dec. 28, 2013 USD ($) item
Description of Business |  |  |  |  |  |  |  |  |  |  |  |  |
Number of broad areas of services | item |  |  |  |  |  |  |  |  |  |  | 2 |  |
Number of business segments | segment |  |  |  |  |  |  |  |  |  |  | 2 |  |
Fiscal Year Change |  |  |  |  |  |  |  |  |  |  |  |  |
Number of weeks periodically contained in a fiscal year | item |  |  |  |  |  |  |  |  |  |  | 53 |  |
Number of weeks in a fiscal year | item |  |  |  |  |  |  |  |  |  |  | 52 | 53 | 52
NeuCo Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  | $ 72,460,000 | $ 76,525,000 | $ 76,535,000 | $ 78,039,000 | $ 78,459,000 | $ 73,483,000 | $ 78,184,000 | $ 76,245,000 | $ 303,559,000 | $ 306,371,000 | $ 278,432,000
Net income |  |  | (2,589,000) | 2,813,000 | 3,202,000 | 2,899,000 | 3,743,000 | 3,189,000 | 3,167,000 | 3,308,000 | 6,325,000 | 13,407,000 | 11,235,000
Net income attributable to CRA International, Inc. allocated to common shares |  |  | (1,307,000) | $ 2,860,000 | $ 3,325,000 | 2,779,000 | $ 3,816,000 | $ 3,224,000 | $ 3,188,000 | $ 3,410,000 | 7,657,000 | 13,638,000 | 11,370,000
Repayments of Notes Payable |  |  |  |  |  |  |  |  |  |  | 300,000 | 26,000 | 700,000
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | $ 606,000 |  |
Goodwill and Intangible Asset Impairment charges |  |  | $ 4,500,000 |  |  |  |  |  |  |  |  |  |
NeuCo, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
NeuCo Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest held by the entity |  |  |  |  |  |  |  |  |  |  | 55.89% |  |
Net revenue |  |  |  |  |  |  |  |  |  |  | $ 3,800,000 | 4,800,000 | 5,100,000
Net income |  |  |  |  |  |  |  |  |  |  | (3,000,000) | (500,000) | (300,000)
Net income attributable to CRA International, Inc. allocated to common shares |  |  |  |  |  |  |  |  |  |  | (1,300,000) | $ (200,000) | $ (200,000)
Notes Payable |  | $ 981,000 |  |  |  |  |  |  |  |  |  |  |
Repayments of Notes Payable |  | $ 375,000 |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  | $ 606,000 |  |  |  |  |  |  |
NeuCo, Inc. | Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
NeuCo Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Notes Payable | $ 75,000 |  |  |  |  |  |  |  |  |  |  |  |
NeuCo, Inc. | Repayments of Notes payable on January 2015 |  |  |  |  |  |  |  |  |  |  |  |  |
NeuCo Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Notes Payable |  |  |  |  |  |  |  |  |  |  | 150,000 |  |
NeuCo, Inc. | Repayments of Notes payable on February 2015 |  |  |  |  |  |  |  |  |  |  |  |  |
NeuCo Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Notes Payable |  |  |  |  |  |  |  |  |  |  | $ 150,000 |  |
NeuCo, Inc. | Repayments of Notes Payable on February 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
NeuCo Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Notes Payable | $ 75,000 |  |  |  |  |  |  |  |  |  |  |  |
NeuCo, Inc. | Board of directors | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
NeuCo Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest held by the entity |  |  |  |  |  |  |  |  |  |  | 5.00% |  |

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