Summary of Significant Accounting Policies	3 Months Ended
Apr. 04, 2026
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Description of Business CRA International, Inc. ("CRA" or the "Company") is a worldwide leading consulting services firm that applies advanced analytic techniques and in-depth industry knowledge to complex engagements for a broad range of clients. CRA offers services in two broad areas: litigation, regulatory, and financial consulting and management consulting. CRA operates in one business segment. CRA operates its business under its registered trade name, Charles River Associates. Basis of Presentation The unaudited condensed consolidated financial statements include the accounts of CRA and its wholly-owned subsidiaries (collectively, the "Company") which require consolidation, after the elimination of intercompany accounts and transactions. These financial statements have been prepared in accordance with the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) for Quarterly Reports on Form 10-Q. Accordingly, these financial statements do not include all the information and note disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”) for annual financial statements. In the opinion of management, these financial statements reflect all adjustments of a normal, recurring nature necessary for the fair presentation of the Company’s results of operations, financial position, cash flows, and shareholders’ equity for the interim periods presented in conformity with U.S. GAAP. Results of operations for the interim periods presented herein are not necessarily indicative of results of operations for a full year. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto for the fiscal year ended January 3, 2026 included in CRA’s Annual Report on Form 10-K filed with the SEC on February 26, 2026. Note 1 to the Consolidated Financial Statements included in Part II, Item 8, on Form 10-K for the fiscal year ended January 3, 2026 describes the significant accounting policies and methods used in preparation of the Condensed Consolidated Financial Statements in this Quarterly Report on Form 10-Q. Recent Accounting Standards Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software On January 4, 2026, CRA adopted Accounting Standards Update ("ASU") No. 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software (“ASU 2025-06”), which modernized the accounting for internal-use software. ASU 2025-06 removed all references to software development stages and requires capitalization of software costs when management has committed to funding the software project and it is probable the project will be completed and the software will be used to perform the function intended. The adoption of ASU 2025‑06 did not have a material impact on CRA’s condensed consolidated financial statements. Recent Accounting Standards Not Yet Adopted Interim Reporting (Topic 270): Narrow‑Scope Improvements In December 2025, the Financial Accounting Standards Board ("FASB") issued ASU 2025‑11, Interim Reporting (Topic 270): Narrow‑Scope Improvements (“ASU 2025‑11”). ASU 2025-11 is intended to improve the navigability of interim reporting guidance by clarifying when Topic 270 applies, enhancing the organization of required interim disclosures, and providing additional direction on the form and content of interim financial statements. The amendments introduce a disclosure principle requiring entities to disclose events occurring after the end of the most recent annual reporting period that have a material impact on the entity. ASU 2025-11 also compiles a comprehensive list of interim disclosures currently required under U.S. GAAP, without expanding or reducing existing requirements. ASU 2025‑11 is effective for interim periods within annual reporting periods beginning after December 15, 2027, for public business entities, with early adoption permitted. CRA is evaluating the impact of the amendments and does not expect them to materially affect its interim reporting, as the changes primarily clarify existing disclosure requirements. Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses ("ASU 2024-03"). ASU 2024-03 requires disclosure, in the notes to the financial statements, specified information about certain costs and expenses including employee compensation, depreciation, and intangible asset amortization. ASU 2024-03, further clarified in ASU 2025-01, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date is effective for CRA for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. CRA expects the adoption of this ASU will have no impact on its financial position or its results of operations, but will result in additional disclosures.

CRA International, Inc. ("CRA" or the "Company") is a worldwide leading consulting services firm that applies advanced analytic techniques and in-depth industry knowledge to complex engagements for a broad range of clients. CRA offers services in two broad areas: litigation, regulatory, and financial consulting and management consulting. CRA operates in one business segment. CRA operates its business under its registered trade name, Charles River Associates.

The unaudited condensed consolidated financial statements include the accounts of CRA and its wholly-owned subsidiaries (collectively, the "Company") which require consolidation, after the elimination of intercompany accounts and transactions. These financial statements have been prepared in accordance with the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) for Quarterly Reports on Form 10-Q. Accordingly, these financial statements do not include all the information and note disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”) for annual financial statements. In the opinion of management, these financial statements reflect all adjustments of a normal, recurring nature necessary for the fair presentation of the Company’s results of operations, financial position, cash flows, and shareholders’ equity for the interim periods presented in conformity with U.S. GAAP. Results of operations for the interim periods presented herein are not necessarily indicative of results of operations for a full year. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto for the fiscal year ended January 3, 2026 included in CRA’s Annual Report on Form 10-K filed with the SEC on February 26, 2026.

Note 1 to the Consolidated Financial Statements included in Part II, Item 8, on Form 10-K for the fiscal year ended January 3, 2026 describes the significant accounting policies and methods used in preparation of the Condensed Consolidated Financial Statements in this Quarterly Report on Form 10-Q.

On January 4, 2026, CRA adopted Accounting Standards Update ("ASU") No. 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software (“ASU 2025-06”), which modernized the accounting for internal-use software. ASU 2025-06 removed all references to software development stages and requires capitalization of software costs when management has committed to funding the software project and it is probable the project will be completed and the software will be used to perform the function intended. The adoption of ASU 2025‑06 did not have a material impact on CRA’s condensed consolidated financial statements.

In December 2025, the Financial Accounting Standards Board ("FASB") issued ASU 2025‑11, Interim Reporting (Topic 270): Narrow‑Scope Improvements (“ASU 2025‑11”). ASU 2025-11 is intended to improve the navigability of interim reporting guidance by clarifying when Topic 270 applies, enhancing the organization of required interim disclosures, and providing additional direction on the form and content of interim financial statements. The amendments introduce a disclosure principle requiring entities to disclose events occurring after the end of the most recent annual reporting period that have a material impact on the entity. ASU 2025-11 also compiles a comprehensive list of interim disclosures currently required under U.S. GAAP, without expanding or reducing existing requirements.

ASU 2025‑11 is effective for interim periods within annual reporting periods beginning after December 15, 2027, for public business entities, with early adoption permitted. CRA is evaluating the impact of the amendments and does not expect them to materially affect its interim reporting, as the changes primarily clarify existing disclosure requirements.

In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses ("ASU 2024-03"). ASU 2024-03 requires disclosure, in the notes to the financial statements, specified information about certain costs and expenses including employee compensation, depreciation, and intangible asset amortization.

Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date is effective for CRA for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. CRA expects the adoption of this ASU will have no impact on its financial position or its results of operations, but will result in additional disclosures.