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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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