3.25.2 html 208 304 1 false 42 0 false 6 false false R1.htm 0000001 - Document - Document and Entity Information Sheet http://www.muellerwaterproducts.com/role/DocumentandEntityInformation Document and Entity Information Cover 1 false false R2.htm 0000002 - Document - Cover Page Document Sheet http://www.muellerwaterproducts.com/role/CoverPageDocument Cover Page Document Cover 2 false false R3.htm 9952151 - Statement - Consolidated Balance Sheets Sheet http://www.muellerwaterproducts.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 3 false false R4.htm 9952152 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.muellerwaterproducts.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 4 false false R5.htm 9952153 - Statement - Consolidated Statements Of Operations Sheet http://www.muellerwaterproducts.com/role/ConsolidatedStatementsOfOperations Consolidated Statements Of Operations Statements 5 false false R6.htm 9952154 - Statement - Consolidated Statement of Comprehensive Income Statement Sheet http://www.muellerwaterproducts.com/role/ConsolidatedStatementofComprehensiveIncomeStatement Consolidated Statement of Comprehensive Income Statement Statements 6 false false R7.htm 9952155 - Statement - Consolidated Statement Of Stockholders' Equity Sheet http://www.muellerwaterproducts.com/role/ConsolidatedStatementOfStockholdersEquity Consolidated Statement Of Stockholders' Equity Statements 7 false false R8.htm 9952156 - Statement - Consolidated Statements Of Cash Flows Sheet http://www.muellerwaterproducts.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements Of Cash Flows Statements 8 false false R9.htm 9952157 - Disclosure - Organization Sheet http://www.muellerwaterproducts.com/role/Organization Organization Notes 9 false false R10.htm 9952158 - Disclosure - Revenue from Contracts with Customers (Notes) Notes http://www.muellerwaterproducts.com/role/RevenuefromContractswithCustomersNotes Revenue from Contracts with Customers (Notes) Notes 10 false false R11.htm 9952159 - Disclosure - Income Taxes Sheet http://www.muellerwaterproducts.com/role/IncomeTaxes Income Taxes Notes 11 false false R12.htm 9952160 - Disclosure - Borrowing Arrangements Sheet http://www.muellerwaterproducts.com/role/BorrowingArrangements Borrowing Arrangements Notes 12 false false R13.htm 9952161 - Disclosure - Retirement Plans Sheet http://www.muellerwaterproducts.com/role/RetirementPlans Retirement Plans Notes 13 false false R14.htm 9952162 - Disclosure - Stock-based Compensation Plans Sheet http://www.muellerwaterproducts.com/role/StockbasedCompensationPlans Stock-based Compensation Plans Notes 14 false false R15.htm 9952163 - Disclosure - Supplemental Balance Sheet Information Sheet http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformation Supplemental Balance Sheet Information Notes 15 false false R16.htm 9952164 - Disclosure - Segment Information Sheet http://www.muellerwaterproducts.com/role/SegmentInformation Segment Information Notes 16 false false R17.htm 9952165 - Disclosure - Accumulated Other Comprehensive Loss Sheet http://www.muellerwaterproducts.com/role/AccumulatedOtherComprehensiveLoss Accumulated Other Comprehensive Loss Notes 17 false false R18.htm 9952166 - Disclosure - Commitments and Contingencies Sheet http://www.muellerwaterproducts.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 18 false false R19.htm 9952167 - Disclosure - Subsequent Events Sheet http://www.muellerwaterproducts.com/role/SubsequentEvents Subsequent Events Notes 19 false false R20.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 20 false false R21.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 21 false false R22.htm 9955511 - Disclosure - Organization Restructuring Rollforward (Tables) Sheet http://www.muellerwaterproducts.com/role/OrganizationRestructuringRollforwardTables Organization Restructuring Rollforward (Tables) Tables 22 false false R23.htm 9955512 - Disclosure - Revenue from Contracts with Customers (Tables) Sheet http://www.muellerwaterproducts.com/role/RevenuefromContractswithCustomersTables Revenue from Contracts with Customers (Tables) Tables http://www.muellerwaterproducts.com/role/RevenuefromContractswithCustomersNotes 23 false false R24.htm 9955513 - Disclosure - Income Taxes Rate Reconciliation (Tables) Sheet http://www.muellerwaterproducts.com/role/IncomeTaxesRateReconciliationTables Income Taxes Rate Reconciliation (Tables) Tables 24 false false R25.htm 9955514 - Disclosure - Borrowing Arrangements (Tables) Sheet http://www.muellerwaterproducts.com/role/BorrowingArrangementsTables Borrowing Arrangements (Tables) Tables http://www.muellerwaterproducts.com/role/BorrowingArrangements 25 false false R26.htm 9955515 - Disclosure - Retirement Plans (Tables) Sheet http://www.muellerwaterproducts.com/role/RetirementPlansTables Retirement Plans (Tables) Tables http://www.muellerwaterproducts.com/role/RetirementPlans 26 false false R27.htm 9955516 - Disclosure - Stock-based Compensation Plans (Tables) Sheet http://www.muellerwaterproducts.com/role/StockbasedCompensationPlansTables Stock-based Compensation Plans (Tables) Tables http://www.muellerwaterproducts.com/role/StockbasedCompensationPlans 27 false false R28.htm 9955517 - Disclosure - Supplemental Balance Sheet Information (Tables) Sheet http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformationTables Supplemental Balance Sheet Information (Tables) Tables http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformation 28 false false R29.htm 9955518 - Disclosure - Segment Information (Tables) Sheet http://www.muellerwaterproducts.com/role/SegmentInformationTables Segment Information (Tables) Tables http://www.muellerwaterproducts.com/role/SegmentInformation 29 false false R30.htm 9955519 - Disclosure - Accumulated Other Comprehensive Loss (Tables) Sheet http://www.muellerwaterproducts.com/role/AccumulatedOtherComprehensiveLossTables Accumulated Other Comprehensive Loss (Tables) Tables http://www.muellerwaterproducts.com/role/AccumulatedOtherComprehensiveLoss 30 false false R31.htm 9955521 - Disclosure - Organization (Narrative) (Details) Sheet http://www.muellerwaterproducts.com/role/OrganizationNarrativeDetails Organization (Narrative) (Details) Details http://www.muellerwaterproducts.com/role/OrganizationRestructuringRollforwardTables 31 false false R32.htm 9955522 - Disclosure - Organization Restructuring (Details) Sheet http://www.muellerwaterproducts.com/role/OrganizationRestructuringDetails Organization Restructuring (Details) Details http://www.muellerwaterproducts.com/role/OrganizationRestructuringRollforwardTables 32 false false R33.htm 9955523 - Disclosure - Revenue from Contracts with Customers (Details) Sheet http://www.muellerwaterproducts.com/role/RevenuefromContractswithCustomersDetails Revenue from Contracts with Customers (Details) Details http://www.muellerwaterproducts.com/role/RevenuefromContractswithCustomersTables 33 false false R34.htm 9955524 - Disclosure - Income Taxes (Narrative) (Details) Sheet http://www.muellerwaterproducts.com/role/IncomeTaxesNarrativeDetails Income Taxes (Narrative) (Details) Details http://www.muellerwaterproducts.com/role/IncomeTaxesRateReconciliationTables 34 false false R35.htm 9955525 - Disclosure - Income Taxes Income Tax Rate Reconciliation (Details) Sheet http://www.muellerwaterproducts.com/role/IncomeTaxesIncomeTaxRateReconciliationDetails Income Taxes Income Tax Rate Reconciliation (Details) Details 35 false false R36.htm 9955526 - Disclosure - Borrowing Arrangements (Narrative) (Details) Sheet http://www.muellerwaterproducts.com/role/BorrowingArrangementsNarrativeDetails Borrowing Arrangements (Narrative) (Details) Details http://www.muellerwaterproducts.com/role/BorrowingArrangementsTables 36 false false R37.htm 9955527 - Disclosure - Borrowing Arrangements (Components Of Long-Term Debt) (Details) Sheet http://www.muellerwaterproducts.com/role/BorrowingArrangementsComponentsOfLongTermDebtDetails Borrowing Arrangements (Components Of Long-Term Debt) (Details) Details http://www.muellerwaterproducts.com/role/BorrowingArrangementsTables 37 false false R38.htm 9955528 - Disclosure - Retirement Plans (Narrative) (Details) Sheet http://www.muellerwaterproducts.com/role/RetirementPlansNarrativeDetails Retirement Plans (Narrative) (Details) Details http://www.muellerwaterproducts.com/role/RetirementPlansTables 38 false false R39.htm 9955529 - Disclosure - Retirement Plans (Net Periodic Benefit Cost) (Details) Sheet http://www.muellerwaterproducts.com/role/RetirementPlansNetPeriodicBenefitCostDetails Retirement Plans (Net Periodic Benefit Cost) (Details) Details http://www.muellerwaterproducts.com/role/RetirementPlansTables 39 false false R40.htm 9955530 - Disclosure - Stock-based Compensation Plans (Narrative) (Details) Sheet http://www.muellerwaterproducts.com/role/StockbasedCompensationPlansNarrativeDetails Stock-based Compensation Plans (Narrative) (Details) Details http://www.muellerwaterproducts.com/role/StockbasedCompensationPlansTables 40 false false R41.htm 9955531 - Disclosure - Stock-based Compensation Plans Grants Table (Details) Sheet http://www.muellerwaterproducts.com/role/StockbasedCompensationPlansGrantsTableDetails Stock-based Compensation Plans Grants Table (Details) Details 41 false false R42.htm 9955532 - Disclosure - Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) Sheet http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformationScheduleOfSelectedSupplementalBalanceSheetInformationDetails Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) Details http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformationTables 42 false false R43.htm 9955533 - Disclosure - Supplemental Balance Sheet Information (Schedule of Accrued Liabilities) (Details) Sheet http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformationScheduleofAccruedLiabilitiesDetails Supplemental Balance Sheet Information (Schedule of Accrued Liabilities) (Details) Details http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformationTables 43 false false R44.htm 9955534 - Disclosure - Supplemental Balance Sheet Information (Goodwill) (Details) Sheet http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformationGoodwillDetails Supplemental Balance Sheet Information (Goodwill) (Details) Details http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformationTables 44 false false R45.htm 9955535 - Disclosure - Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) Sheet http://www.muellerwaterproducts.com/role/SegmentInformationScheduleOfSelectedSupplementalBalanceSheetInformationDetails Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) Details http://www.muellerwaterproducts.com/role/SegmentInformationTables 45 false false R46.htm 9955536 - Disclosure - Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) Sheet http://www.muellerwaterproducts.com/role/AccumulatedOtherComprehensiveLossScheduleOfAccumulatedOtherComprehensiveLossDetails Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) Details http://www.muellerwaterproducts.com/role/AccumulatedOtherComprehensiveLossTables 46 false false R47.htm 9955537 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.muellerwaterproducts.com/role/CommitmentsandContingenciesDetails Commitments and Contingencies (Details) Details http://www.muellerwaterproducts.com/role/CommitmentsandContingencies 47 false false R48.htm 9955538 - Disclosure - Subsequent Events (Details) Sheet http://www.muellerwaterproducts.com/role/SubsequentEventsDetails Subsequent Events (Details) Details http://www.muellerwaterproducts.com/role/SubsequentEvents 48 false false R49.htm 9955539 - Disclosure - Commitment and Contingencies (Details) Sheet http://www.muellerwaterproducts.com/role/CommitmentandContingenciesDetails Commitment and Contingencies (Details) Details 49 false false All Reports Book All Reports mwa-20250630.htm mwa-20250630.xsd mwa-20250630_cal.xml mwa-20250630_def.xml mwa-20250630_lab.xml mwa-20250630_pre.xml http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true