Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2025
Accounting Policies [Abstract]
Basis of Presentation	The unaudited condensed consolidated financial statements of FTI Consulting, Inc., including its consolidated subsidiaries (collectively, the “Company,” “we,” “our” or “FTI Consulting”), presented herein, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and under the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial information. Some of the information and footnote disclosures normally included in annual financial statements have been condensed or omitted pursuant to those rules and regulations. Certain prior period amounts have been reclassified to conform to the current period presentation. In management’s opinion, the interim financial statements reflect all adjustments that are necessary for a fair presentation of the results for the interim periods presented. All adjustments made were normal recurring accruals. The fair values of all financial instruments are estimated to be equal to their carrying values as of September 30, 2025 and December 31, 2024. 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 the notes thereto contained in our Annual Report on Form 10-K for the year ended December 31, 2024 filed with the SEC.
New Accounting Standards	In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which expands annual disclosures in an entity’s income tax rate reconciliation table and requires annual disclosures regarding cash taxes paid both in the United States (“U.S.”) (federal, state and local) and foreign jurisdictions. The amendments in this ASU are effective for annual periods beginning after December 15, 2024, although early adoption is permitted. The Company does not expect the adoption of this ASU to have a material impact on its consolidated financial statements, but it will result in additional annual disclosures. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, which requires additional, disaggregated disclosure around certain income statement expense line items. The amendments in this ASU are effective for annual periods beginning after December 15, 2026 and interim periods beginning after December 15, 2027, although early adoption is permitted. The Company is in the process of evaluating the impact of this new guidance on its consolidated financial statements. In September 2025, the FASB issued ASU 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software, which modernizes the accounting for internal-use software costs by increasing the operability of the recognition guidance to reflect neutrality toward different methods of software development. The amendments in this ASU are effective for annual and interim periods beginning after December 15, 2027 and can be applied prospectively, retrospectively, or with a modified transition approach. Early adoption is permitted. The Company is in the process of evaluating the impact of this new guidance on its consolidated financial statements.

Basis of Presentation and Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2025

The unaudited condensed consolidated financial statements of FTI Consulting, Inc., including its consolidated subsidiaries (collectively, the “Company,” “we,” “our” or “FTI Consulting”), presented herein, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and under the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial information. Some of the information and footnote disclosures normally included in annual financial statements have been condensed or omitted pursuant to those rules and regulations. Certain prior period amounts have been reclassified to conform to the current period presentation. In management’s opinion, the interim financial statements reflect all adjustments that are necessary for a fair presentation of the results for the interim periods presented. All adjustments made were normal recurring accruals. The fair values of all financial instruments are estimated to be equal to their carrying values as of September 30, 2025 and December 31, 2024. 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 the notes thereto contained in our Annual Report on Form 10-K for the year ended December 31, 2024 filed with the SEC.

New Accounting Standards

In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which expands annual disclosures in an entity’s income tax rate reconciliation table and requires annual disclosures regarding cash taxes paid both in the United States (“U.S.”) (federal, state and local) and foreign jurisdictions. The amendments in this ASU are effective for annual periods beginning after December 15, 2024, although early adoption is permitted. The Company does not expect the adoption of this ASU to have a material impact on its consolidated financial statements, but it will result in additional annual disclosures.

In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, which requires additional, disaggregated disclosure around certain income statement expense line items. The amendments in this ASU are effective for annual periods beginning after December 15, 2026 and interim periods beginning after December 15, 2027, although early adoption is permitted. The Company is in the process of evaluating the impact of this new guidance on its consolidated financial statements.

In September 2025, the FASB issued ASU 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software, which modernizes the accounting for internal-use software costs by increasing the operability of the recognition guidance to reflect neutrality toward different methods of software development. The amendments in this ASU are effective for annual and interim periods beginning after December 15, 2027 and can be applied prospectively, retrospectively, or with a modified transition approach. Early adoption is permitted. The Company is in the process of evaluating the impact of this new guidance on its consolidated financial statements.