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Related-Party Transactions	12 Months Ended
	Jan. 02, 2021
Related Party Transactions [Abstract]
Related-Party Transactions	Related-Party TransactionsCRA made payments to shareholders of CRA who performed consulting services exclusively for CRA in the amounts of $9.8 million, $9.3 million, and $8.8 million in fiscal 2020, fiscal 2019, and fiscal 2018, respectively. These payments were to exclusive non-employee experts for consulting services performed for CRA's clients in the ordinary course of business.

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- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-URI http://asc.fasb.org/topic&trid=2122745

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