Subsequent Events	3 Months Ended
Apr. 04, 2026
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On May 4, 2026, the Credit Agreement was amended and restated to increase the capacity of the revolving credit facility by $50.0 million to $300.0 million. On May 7, 2026, CRA announced that its Board of Directors declared a quarterly cash dividend of $0.57 per common share, payable on June 12, 2026 to shareholders of record as of May 26, 2026.

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/855/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

Name:	us-gaap_SubsequentEventsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration