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Summary of Significant Accounting Policies - Revenue Recognition and Allowances for Accounts Receivable and Unbilled Services (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Revenue Recognition
Cumulative effect of a change in accounting principle	$ 205,834	$ 209,019	$ 197,751	$ 196,472
Retained Earnings
Revenue Recognition
Cumulative effect of a change in accounting principle	$ 215,784	$ 216,999	200,249	$ 186,229
Cumulative Effect Period of Adoption, Adjustment
Revenue Recognition
Cumulative effect of a change in accounting principle			(203)
Cumulative Effect Period of Adoption, Adjustment | Retained Earnings
Revenue Recognition
Cumulative effect of a change in accounting principle			(203)
Cumulative Effect Period of Adoption, Adjustment | ASC 326 | Retained Earnings
Revenue Recognition
Cumulative effect of a change in accounting principle			$ (200)
Minimum
Revenue Recognition
Period in which engagements are generally completed (months)	3 months
Maximum
Revenue Recognition
Period in which engagements are generally completed (months)	6 months

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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