Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jul. 02, 2022
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 International, Inc. 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 (“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 CRA’s results of operations, financial position, cash flows, and shareholders’ equity for the interim periods presented in conformity with 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 1, 2022 included in CRA’s Annual Report on Form 10-K filed with the SEC on March 3, 2022 (the “2021 Form 10-K”). Certain prior period amounts have been reclassified to conform to the current period presentation. These reclassifications had no effect on previously reported results of operations, financial position, or cash flows. Estimates The preparation of financial statements in conformity with GAAP requires management to make significant estimates and judgments that affect the reported amounts of assets and liabilities, as well as the related disclosure of contingent assets and liabilities, at the date of the financial statements, and the reported amounts of consolidated revenues and expenses during the reporting period. Estimates in these condensed consolidated financial statements include, but are not limited to, allowances for accounts receivable and unbilled services, revenue recognition on fixed-price contracts, variable consideration to be included in the transaction price of revenue contracts, the useful life of long-lived assets, measurement of operating lease right-of-use (“ROU”) assets and liabilities, share-based compensation, valuation of acquired intangible assets, goodwill, accrued and deferred income taxes, valuation allowances on deferred tax assets, accrued incentive compensation, and certain other accrued expenses. These items are monitored and analyzed by CRA for changes in facts and circumstances, and material changes in these estimates could occur in the future. Changes in estimates are recorded in the period in which they become known. CRA bases its estimates on historical experience and various other assumptions that CRA believes to be reasonable under the circumstances. Actual results may differ from those estimates if CRA’s assumptions based on past experience or other assumptions do not turn out to be substantially accurate. Business Combinations CRA accounts for business acquisitions using the acquisition method of accounting, which requires assets acquired and liabilities assumed to be measured and recorded at their estimated fair values as of the acquisition date, with certain exceptions. The purchase price is determined as the fair value of consideration transferred. Goodwill is recognized for the excess of consideration transferred over the net value of assets acquired and liabilities assumed. The operating results of each acquired company is included in CRA's consolidated financial statements beginning on the date of acquisition. Fair value measurements require extensive use of estimates and assumptions, including estimates of future cash flows to be generated by the acquired assets. The useful lives of identifiable intangible assets acquired in a business acquisition are estimated based on the expected period that the Company will receive substantially all projected future benefits from the intangible asset. Transaction expenses directly related to acquisitions are expensed as incurred and are included in selling, general and administrative expenses on the condensed consolidated statements of operations. Recent Accounting Standards Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers In October 2021, the FASB issued Accounting Standards Update ("ASU") No. 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers ("ASU 2021-08"). The ASU requires that an acquirer recognize and measure contract assets and liabilities acquired in a business combination in accordance with ASC Topic 606, Revenue from Contracts with Customers ("ASC 606") at the acquisition date as if the acquirer had originated the contracts rather than adjust them to fair value. CRA elected to early adopt ASU 2021-08 on the first day of fiscal 2022. The adoption of the new standard had no impact on CRA's financial position, results of operations, cash flows, or disclosures on the date of transition.