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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Dec. 29, 2019	Dec. 28, 2019	Dec. 29, 2018
Disaggregation of Revenue
Consulting services revenues	$ 126,158	$ 105,849
Cumulative-effect adjustment to retained earnings	204,679			$ 200,249
Cumulative-effect adjustment to allowances for accounts receivable	494			370	$ 639
Cumulative-effect adjustment to unbilled services	44,377			$ 36,569
ASU 2016-13 Financial Instruments-Credit Losses Topic 326 | Restatement 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	100,740	83,529
United Kingdom
Disaggregation of Revenue
Consulting services revenues	19,066	18,507
Other
Disaggregation of Revenue
Consulting services revenues	6,352	3,813
Fixed Price
Disaggregation of Revenue
Consulting services revenues	28,988	21,386
Time-and-materials
Disaggregation of Revenue
Consulting services revenues	$ 97,170	$ 84,463

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