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Business Segment and Geographic Information (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 13, 2016 segment | Sep. 30, 2017 USD ($) item | Oct. 01, 2016 USD ($) | Sep. 30, 2017 USD ($) item | Oct. 01, 2016 USD ($) | Dec. 30, 2017 segment | Dec. 31, 2016 USD ($)
Business segment and geographic information |  |  |  |  |  |  |
Number of Broad Areas of Consulting Services | item |  | 2 |  | 2 |  |  |
Number of business segments | segment | 2 |  |  |  |  | 1 |
Revenues |  | $ 91,325 | $ 81,691 | $ 273,059 | $ 245,210 |  |
Total Long-lived assets (property and equipment, net) |  | $ 41,062 |  | $ 41,062 |  |  | $ 36,381
Revenue Benchmark | Revenue Concentration Risk |  |  |  |  |  |  |
Business segment and geographic information |  |  |  |  |  |  |
Number of Broad Areas of Consulting Services | item |  | 2 |  | 2 |  |  |
Percentage of consolidated revenues |  | 100.00% |  | 100.00% |  | 100.00% | 100.00%
United States |  |  |  |  |  |  |
Business segment and geographic information |  |  |  |  |  |  |
Revenues |  | $ 70,910 | 63,955 | $ 217,608 | 189,832 |  |
Total Long-lived assets (property and equipment, net) |  | 34,005 |  | 34,005 |  |  | $ 30,735
United Kingdom |  |  |  |  |  |  |
Business segment and geographic information |  |  |  |  |  |  |
Revenues |  | 13,572 | 12,463 | 40,444 | 40,421 |  |
Total Long-lived assets (property and equipment, net) |  | 5,560 |  | 5,560 |  |  | 5,253
Other |  |  |  |  |  |  |
Business segment and geographic information |  |  |  |  |  |  |
Revenues |  | 6,843 | 5,273 | 15,007 | 14,957 |  |
Total Long-lived assets (property and equipment, net) |  | 1,497 |  | 1,497 |  |  | 393
Total foreign |  |  |  |  |  |  |
Business segment and geographic information |  |  |  |  |  |  |
Revenues |  | 20,415 | $ 17,736 | 55,451 | $ 55,378 |  |
Total Long-lived assets (property and equipment, net) |  | $ 7,057 |  | $ 7,057 |  |  | $ 5,646

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