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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Disaggregation of Revenue
Consulting services revenues	$ 108,763	$ 103,871	$ 105,538	$ 99,476	$ 97,016	$ 91,325	$ 93,563	$ 88,171	$ 417,648	$ 370,075	$ 324,779
GNU
Disaggregation of Revenue
Consulting services revenues									0	0	800
United States
Disaggregation of Revenue
Consulting services revenues									329,678	295,232	251,962
United Kingdom
Disaggregation of Revenue
Consulting services revenues									65,874	53,644	52,509
Other
Disaggregation of Revenue
Consulting services revenues									22,096	21,199	20,308
Fixed Price
Disaggregation of Revenue
Consulting services revenues									95,096	93,570	55,100
Time-and-materials
Disaggregation of Revenue
Consulting services revenues									$ 322,552	$ 276,505	268,853
Other
Disaggregation of Revenue
Consulting services revenues											$ 826

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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=82913847&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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