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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Dec. 29, 2019	Dec. 28, 2019	Dec. 29, 2018
Disaggregation of Revenue
Consulting services revenues	$ 123,031	$ 110,573	$ 249,189	$ 216,422
Cumulative-effect adjustment to retained earnings	208,784		208,784			$ 200,249
Cumulative-effect adjustment to allowances for accounts receivable	392		392			370	$ 639
Cumulative-effect adjustment to unbilled services	50,159		50,159			$ 36,569
ASU 2016-13 Financial Instruments-Credit Losses Topic 326 | Cumulative-effect adjustment
Disaggregation of Revenue
Cumulative-effect adjustment to retained earnings					$ 200
Cumulative-effect adjustment to allowances for accounts receivable					200
Cumulative-effect adjustment to unbilled services					$ 200
United States
Disaggregation of Revenue
Consulting services revenues	99,416	87,475	200,156	171,004
United Kingdom
Disaggregation of Revenue
Consulting services revenues	17,931	17,404	36,997	35,911
Other
Disaggregation of Revenue
Consulting services revenues	5,684	5,694	12,036	9,507
Fixed Price
Disaggregation of Revenue
Consulting services revenues	30,783	25,179	59,771	46,565
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 92,248	$ 85,394	$ 189,418	$ 169,857

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