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Business Segment and Geographic Information (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 13, 2016 segment | Dec. 30, 2017 USD ($) item | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 01, 2016 USD ($) | Jul. 02, 2016 USD ($) | Apr. 02, 2016 USD ($) | Jul. 02, 2016 segment | Dec. 30, 2017 USD ($) segment item | Dec. 31, 2016 USD ($) | Jan. 02, 2016 USD ($)
Business segment and geographic information |  |  |  |  |  |  |  |  |  |  |  |  |
Number of broad areas of consulting services | item |  | 2 |  |  |  |  |  |  |  |  | 2 |  |
Number of business segments | segment | 2 |  |  |  |  |  |  |  |  | 2 | 1 |  |
Revenues |  | $ 97,016 | $ 91,325 | $ 93,563 | $ 88,171 | $ 79,569 | $ 81,691 | $ 82,607 | $ 80,912 |  | $ 370,075 | $ 324,779 | $ 303,559
Total Long-lived assets (property and equipment, net) |  | $ 44,643 |  |  |  | 36,381 |  |  |  |  | $ 44,643 | $ 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% |
United States |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment and geographic information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 295,232 | $ 251,962 | 243,261
Total Long-lived assets (property and equipment, net) |  | $ 37,192 |  |  |  | 30,735 |  |  |  |  | 37,192 | 30,735 |
United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment and geographic information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 53,644 | 52,509 | 44,248
Total Long-lived assets (property and equipment, net) |  | 5,552 |  |  |  | 5,253 |  |  |  |  | 5,552 | 5,253 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment and geographic information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 21,199 | 20,308 | 16,050
Total Long-lived assets (property and equipment, net) |  | 1,899 |  |  |  | 393 |  |  |  |  | 1,899 | 393 |
Total foreign |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment and geographic information |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 74,843 | 72,817 | $ 60,298
Total Long-lived assets (property and equipment, net) |  | $ 7,451 |  |  |  | $ 5,646 |  |  |  |  | $ 7,451 | $ 5,646 |

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