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[Member] Five Year Revolving Credit Facility 2019 [Member] Reclassification of unrealized gain on foreign exchange agreements into cost of revenue Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Cost of Revenue, before Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Cost of Revenue, before Tax Effective tax rate Effective Income Tax Rate Reconciliation, Percent Operating income Operating income Operating Income (Loss) Number of reportable segments Number of Reportable Segments Total liabilities and stockholders’ equity Liabilities and Equity Subsequent Events Subsequent Events [Text Block] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Hedging Designation [Axis] Hedging Designation [Axis] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Adjustment for Condition Achieved (in usd per share) Share-based Compensation 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Statement [Line Items] Schedule of Stockholders Equity Schedule of Stockholders Equity [Table Text Block] Total Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Business Combination, Consideration Transferred Business Combination, Consideration Transferred Business Combination, Consideration Transferred Foreign currency and other Contract With Customer, Liability, Other Contract With Customer, Liability, Other Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Software Software Software Development [Member] Redemption price percentage Redemption Price Percentage Redemption price percentage. Minimum Minimum [Member] Debt issuance costs and unamortized discount Unamortized Debt Issuance Expense Adoption Date Trading Arrangement Adoption Date Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance [Member] Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance Segments [Axis] Segments [Axis] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Revenue Derivative Instrument [Axis] Derivative Instrument [Axis] Senior Notes Due Long-Term Debt, Gross Exercise Price Award Exercise Price Arrangement Duration Trading Arrangement Duration Effect of derivative financial instruments Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Stockholders’ equity: Equity, Attributable to Parent [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Business Combination, Consideration Transferred, Equity Interest Issued And Issuable, Replacement Equity Awards Business Combination, Consideration Transferred, Equity Interest Issued And Issuable, Replacement Equity Awards Business Combination, Consideration Transferred, Equity Interest Issued And Issuable, Replacement Equity Awards Term of debt Debt Instrument, Term All Individuals All Individuals [Member] Net charges for product warranties in the period Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties Expected price of additional ownership percentage Business Combination, Price of Acquisition, Expected Background and Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Other non-operating income, net Other non-operating income Other Nonoperating Income (Expense) Other intangible assets, net Other Intangibles, Net Intangibles Intangible Assets, Net (Excluding Goodwill) Components of net periodic benefit cost and other amounts recognized in other comprehensive income Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] Foreign currency translation adjustment for post-retirement benefit plans Other Comprehensive Income (Loss), Foreign Exchange for Pension and Non-Pension Postretirement Benefit Plans, before tax Other Comprehensive Income (Loss), Foreign Exchange for Pension and Non-Pension Postretirement Benefit Plans, before tax Restructuring Cost and Reserve [Line Items] Restructuring Cost and Impairment Charge Restructuring Cost and Reserve [Line Items] Summary of Intangible Assets Acquired Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Guarantee amounts Guarantor Obligations, Current Carrying Value Applied Water Applied Water Applied Water [Member] Applied Water [Member] Deferred income tax liabilities Deferred Income Tax Liabilities, Net Volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Summary of restricted stock activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Interest Expense Interest Expense [Member] Short-term borrowings and current maturities of long-term debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-Term Debt Opening balance from the acquisition of Evoqua Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination Share Repurchase Program [Domain] Share Repurchase Program [Domain] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Components of net periodic benefit cost and other amounts recognized in other comprehensive income : Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Measure: Measure [Axis] Issuance of replacement equity awards Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Goodwill Adjustment Due To Segment Reallocation Goodwill Adjustment Due To Segment Reallocation [Member] Goodwill Adjustment Due To Segment Reallocation 2024 Plan Two Thousand Twenty Four Restructuring Plan [Member] Two Thousand Twenty Four Restructuring Plan Entity Emerging Growth Company Entity Emerging Growth Company Statement of Financial Position Location, Activity, Accrual [Domain] Statement of Financial Position Location, Activity, Accrual [Domain] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Accrued and Other Current Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Warranty accrual – January 1 Warranty accrual – September 30 Standard Product Warranty Accrual Equity Component [Domain] Equity Component [Domain] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Other Intangible Assets Schedule Of Intangible Assets Excluding Goodwill [Table Text Block] Schedule of intangible assets excluding goodwill. Statement [Table] Statement [Table] Recently Issued Accounting Pronouncements Significant Accounting Policies [Text Block] Consolidation Items [Domain] Consolidation Items [Domain] Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Total expected costs remaining Restructuring and Related Cost, Expected Cost Remaining Capital expenditures Capital expenditures Payments to Acquire Productive Assets Global Omnium Idrica, S.L. Global Omnium Idrica, S.L. [Member] Global Omnium Idrica, S.L. Total current assets Assets, Current Receivables, net Accounts Receivable, before Allowance for Credit Loss Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Senior Notes Senior Notes [Member] Inventories Inventory, Net, Combining Work in Process and Raw Materials Alternative [Abstract] Assets Foreign Currency Cash Flow Hedge Asset at Fair Value Options exercisable, ending of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Employer contribution to defined benefit plan Defined Benefit Plan, Plan Assets, Contributions by Employer Other intangible assets, net Fair Value (in millions) Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Other Other Intangible Assets [Member] Income Taxes Income Tax Disclosure [Text Block] Legacy Evoqua Stockholders Legacy Evoqua Stockholders [Member] Legacy Evoqua Stockholders Buy AUD Sell EUR Buy AUD Sell EUR [Member] Buy AUD Sell EUR Domestic defined benefit pension plans Domestic Plan [Member] Supplier Finance Program Supplier Finance Program [Table Text Block] Other non-current assets Other Noncurrent Assets, Before Depreciation Other Noncurrent Assets, Before Depreciation Other non-current accrued liabilities Other Noncurrent Liabilities [Member] Net Cash – Financing activities Net Cash Provided by (Used in) Financing Activities Credit Facility [Axis] Credit Facility [Axis] Return on Invested Capital Performance-Based Shares Return on Invested Capital Performance-Based Shares [Member] Return on Invested Capital Performance-Based Shares [Member] Long-term debt, fair value Long-Term Debt, Fair Value Entity Registrant Name Entity Registrant Name Weighted-average fair value / share (in usd per share) Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Fair Value Share based compensation arrangement by share based payment award fair value assumptions weighted average fair value. Components of restructuring and asset impairment charges Schedule of Components of Restructuring and Asset Impairment Charges [Table Text Block] Schedule of Components of Restructuring and Asset Impairment Charges [Table Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Depreciation and amortization Depreciation, Depletion and Amortization Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Gross profit Gross Profit Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Changes in product warranty accrual Schedule of Product Warranty Liability [Table Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Aggregate intrinsic value, vested and expected to vest Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Geographical [Domain] Geographical [Domain] Other Other Geographical Regions [Member] Other Geographical Regions [Member] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Issuance of common stock Stock Issued During Period, Value, New Issues Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Authorized 750.0 shares, issued 259.2 shares and 257.6 shares in 2024 and 2023, respectively Common Stock, Value, Issued Opening balance from the acquisition of Evoqua Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Stock Issued During Period, Shares, Acquisitions Stock Issued During Period, Shares, Acquisitions Finite-Lived Intangible Assets Finite-Lived Intangible Assets [Line Items] Impairment of intangible assets Impairment of Intangible Assets (Excluding Goodwill) Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Basic (usd per share) Basic earnings per share (usd per share) Earnings Per Share, Basic Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Euro Commercial Paper Program Euro Commercial Paper Program [Member] Euro Commercial Paper Program [Member] Ownership [Domain] Ownership [Domain] Trademarks Trademarks Trademarks [Member] Customer-related liabilities Customer Related Liabilities Current Customer related liabilities current. 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Grant, Awarded Percentage Target Share Based Compensation Arrangement By Share Based Payment Award, Revenue Performance Share Unit Grant, Awarded Percentage Target Stock based compensation expense included within AOCL Restructuring Reserve, Share Based Compensation Restructuring Reserve, Share Based Compensation Entity Address, City or Town Entity Address, City or Town Long-term debt issued, net Proceeds from Issuance of Long-Term Debt Total Shareholder Return Performance-Based Shares Total Shareholder Return Performance-Based Shares [Member] Total Shareholder Return Performance-Based Shares [Member] Total intrinsic value of options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Granted (in usd per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Forfeited (in shares) Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Useful Life (in years) Acquired Finite-Lived Intangible Assets, Useful Life Acquired Finite-Lived Intangible Assets, Useful Life Business Acquisition [Axis] Business Acquisition [Axis] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Revenue Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Shares repurchased Treasury Stock, Value, Acquired, Cost Method Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Severance and other charges Severance Costs Other accrued liabilities Other Accrued Liabilities, Current Document Period End Date Document Period End Date Finished goods 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