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for Repurchase of Common Stock Deferred revenue Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Short-term lease expense Short-Term Lease, Cost Sublease income payment remainder of fiscal year Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net of allowances of $3,173 and $2,877 Accounts Receivable, after Allowance for Credit Loss, Current Class of Treasury Stock Class of Treasury Stock [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Equity Securities, FV-NI Equity Securities, FV-NI Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change 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and Equity Variable lease expense Variable Lease, Cost Interest Income, Other Interest Income, Other Restructuring Charges Restructuring, Impairment, and Other Activities Disclosure [Text Block] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Schedule of Revenues by Geographic Region [Table] Schedule of Long-lived Assets by Geographic Region [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segments [Axis] Segments [Axis] Schedule of Product Revenues by Systems and Software Schedule of Product Information [Table Text Block] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Restructuring charges Restructuring Charges Plan Name [Axis] Plan Name [Axis] Tabular List, Table Tabular List [Table Text Block] Equity Securities, FV-NI, Noncurrent Equity Securities, FV-NI, Noncurrent Numerator Numerator [Abstract] Numerator [Abstract] Other income, net Other Nonoperating Income (Expense) Name Awards Close in Time to MNPI Disclosures, Individual Name Purchases of investments Payments to Acquire Investments Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] General and administrative General and Administrative Expense Property, Plant and Equipment, Type [Domain] Long-Lived Asset, Class [Domain] Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, no par value; 10,000 shares authorized, no shares issued and outstanding Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Software Software [Member] Software Share Repurchase Program [Axis] Share Repurchase Program [Axis] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount October Twenty Six Two Thousand Ten Program October Twenty Six Two Thousand Ten Program [Member] October Twenty Six Two Thousand Ten Program Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) 2031 Lessee, Operating Lease, Liability, to be Paid, Year Five F5, Inc. 2026 Incentive Award Plan [Member] F5, Inc. 2026 Incentive Award Plan [Member] F5, Inc. 2026 Incentive Award Plan Debt Instrument [Line Items] Debt Instrument [Line Items] Other current assets Increase (Decrease) in Other Current Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Entity Filer Category Entity Filer Category Short-Term Investments Short-Term Investments Debt Instrument, Interest Rate, Basis for Effective Rate Debt Instrument, Interest Rate, Basis for Effective Rate Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Maturities of investments Proceeds from Maturity of Investments Proceeds from Maturity of Investments Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four Current assets Assets, Current [Abstract] Weighted average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-use assets obtained in exchange for lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Provision for income taxes Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Customer Concentration Risk Customer Concentration Risk [Member] Cost of net revenues Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Michael Montoya [Member] Michael Montoya Net income Net income Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Taxes paid related to net share settlement of equity awards Cost of Issuance of Treasury Stock Cost of Issuance of Treasury Stock Capitalized Contract Cost, Impairment Loss Capitalized Contract Cost, Impairment Loss Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Net revenues Revenues [Abstract] Unrecorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year Unrecorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]