Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2025
Accounting Policies [Abstract]
Basis of Presentation and Preparation	Basis of Presentation and Preparation—The unaudited condensed consolidated financial statements of Fortinet, Inc. and its subsidiaries (collectively, “we,” “us” or “our”) have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information, as well as the instructions to Form 10-Q pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements, and should be read in conjunction with our audited consolidated financial statements as of and for the year ended December 31, 2024, contained in our Annual Report on Form 10-K filed with the SEC on February 21, 2025. In the opinion of management, all adjustments, which include normal recurring adjustments, considered necessary for a fair presentation, have been included. The results of operations for the three and six months ended June 30, 2025 are not necessarily indicative of the results to be expected for the full year or for any future periods. The condensed consolidated balance sheet as of December 31, 2024 is derived from the audited consolidated financial statements for the year ended December 31, 2024. Amounts previously reported as gain on bargain purchase are included in other income (expense)—net in prior periods to conform with current period presentation in our condensed consolidated statements of income. Amounts previously reported as loss from equity method investments and gain on bargain purchase are included in other in prior periods to conform with current period presentation in section of net cash provided by operating activities in our condensed consolidated statements of cash flows. The condensed consolidated financial statements include the accounts of Fortinet, Inc. and its subsidiaries. We consolidate all legal entities in which we have an absolute controlling financial interest. All intercompany balances and transactions have been eliminated in consolidation. The preparation of the condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. There have been no material changes to our significant accounting policies as of and for the six months ended June 30, 2025, as compared to the significant accounting policies described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2024 filed with the SEC.
Recent Accounting Standards Not Yet Effective	Recent Accounting Standards Not Yet Effective Income Taxes In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which includes amendments that further enhance income tax disclosures, primarily through standardization and disaggregation of rate reconciliation categories and income taxes paid by jurisdiction. The amendments are effective for our annual period beginning fiscal year 2025, with early adoption permitted, and should be applied prospectively. We are currently evaluating the ASU to determine its impact on our disclosures. Income Statement 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 (ASU 2024-03), and in January 2025, the FASB issued ASU No. 2025-01, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, which clarified the effective date of ASU 2024-03. ASU 2024-03 enhances the disclosures required for expense disaggregation in our annual and interim consolidated financial statements. The amendments are effective for our annual reporting period beginning fiscal year 2027, with early adoption permitted, and can be applied prospectively or retrospectively. We are currently evaluating the ASU to determine its impact on our disclosures.