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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Disaggregation of Revenue
Consulting services revenues	$ 110,573	$ 105,538	$ 216,422	$ 205,014
United States
Disaggregation of Revenue
Consulting services revenues	87,475	85,751	171,004	164,157
United Kingdom
Disaggregation of Revenue
Consulting services revenues	17,404	14,858	35,911	30,064
Other
Disaggregation of Revenue
Consulting services revenues	5,694	4,929	9,507	10,793
Fixed Price
Disaggregation of Revenue
Consulting services revenues	25,179	20,666	46,565	41,385
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 85,394	$ 84,872	$ 169,857	$ 163,629

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+ References

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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