3.23.1 html 162 265 1 false 33 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 0000003 - Statement - Consolidated Balance Sheets Sheet http://www.muellerwaterproducts.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 3 false false R4.htm 0000004 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.muellerwaterproducts.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 4 false false R5.htm 0000005 - Statement - Consolidated Statements Of Operations Sheet http://www.muellerwaterproducts.com/role/ConsolidatedStatementsOfOperations Consolidated Statements Of Operations Statements 5 false false R6.htm 0000006 - 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 0000007 - Statement - Consolidated Statement Of Stockholders' Equity Sheet http://www.muellerwaterproducts.com/role/ConsolidatedStatementOfStockholdersEquity Consolidated Statement Of Stockholders' Equity Statements 7 false false R8.htm 0000008 - Statement - Consolidated Statements Of Cash Flows Sheet http://www.muellerwaterproducts.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements Of Cash Flows Statements 8 false false R9.htm 0000009 - Disclosure - Organization Sheet http://www.muellerwaterproducts.com/role/Organization Organization Notes 9 false false R10.htm 0000010 - 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 0000011 - Disclosure - Income Taxes Sheet http://www.muellerwaterproducts.com/role/IncomeTaxes Income Taxes Notes 11 false false R12.htm 0000012 - Disclosure - Borrowing Arrangements Sheet http://www.muellerwaterproducts.com/role/BorrowingArrangements Borrowing Arrangements Notes 12 false false R13.htm 0000014 - Disclosure - Retirement Plans Sheet http://www.muellerwaterproducts.com/role/RetirementPlans Retirement Plans Notes 13 false false R14.htm 0000015 - Disclosure - Stock-based Compensation Plans Sheet http://www.muellerwaterproducts.com/role/StockbasedCompensationPlans Stock-based Compensation Plans Notes 14 false false R15.htm 0000016 - Disclosure - Supplemental Balance Sheet Information Sheet http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformation Supplemental Balance Sheet Information Notes 15 false false R16.htm 0000017 - Disclosure - Accumulated Other Comprehensive Loss Sheet http://www.muellerwaterproducts.com/role/AccumulatedOtherComprehensiveLoss Accumulated Other Comprehensive Loss Notes 16 false false R17.htm 0000018 - Disclosure - Segment Information Sheet http://www.muellerwaterproducts.com/role/SegmentInformation Segment Information Notes 17 false false R18.htm 0000019 - Disclosure - Commitments and Contingencies Sheet http://www.muellerwaterproducts.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 18 false false R19.htm 0000020 - Disclosure - Subsequent Events Sheet http://www.muellerwaterproducts.com/role/SubsequentEvents Subsequent Events Notes 19 false false R20.htm 0000022 - Disclosure - Organization Restructuring Rollforward (Tables) Sheet http://www.muellerwaterproducts.com/role/OrganizationRestructuringRollforwardTables Organization Restructuring Rollforward (Tables) Tables 20 false false R21.htm 0000023 - 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 21 false false R22.htm 0000024 - Disclosure - Income Taxes Rate Reconciliation (Tables) Sheet http://www.muellerwaterproducts.com/role/IncomeTaxesRateReconciliationTables Income Taxes Rate Reconciliation (Tables) Tables 22 false false R23.htm 0000025 - Disclosure - Borrowing Arrangements (Tables) Sheet http://www.muellerwaterproducts.com/role/BorrowingArrangementsTables Borrowing Arrangements (Tables) Tables http://www.muellerwaterproducts.com/role/BorrowingArrangements 23 false false R24.htm 0000027 - Disclosure - Retirement Plans (Tables) Sheet http://www.muellerwaterproducts.com/role/RetirementPlansTables Retirement Plans (Tables) Tables http://www.muellerwaterproducts.com/role/RetirementPlans 24 false false R25.htm 0000028 - 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 25 false false R26.htm 0000029 - 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 26 false false R27.htm 0000030 - 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 27 false false R28.htm 0000031 - Disclosure - Segment Information (Tables) Sheet http://www.muellerwaterproducts.com/role/SegmentInformationTables Segment Information (Tables) Tables http://www.muellerwaterproducts.com/role/SegmentInformation 28 false false R29.htm 0000033 - Disclosure - Organization (Details) Sheet http://www.muellerwaterproducts.com/role/OrganizationDetails Organization (Details) Details http://www.muellerwaterproducts.com/role/OrganizationRestructuringRollforwardTables 29 false false R30.htm 0000034 - Disclosure - Organization Restructuring (Details) Sheet http://www.muellerwaterproducts.com/role/OrganizationRestructuringDetails Organization Restructuring (Details) Details http://www.muellerwaterproducts.com/role/OrganizationRestructuringRollforwardTables 30 false false R31.htm 0000035 - 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 31 false false R32.htm 0000036 - Disclosure - Income Taxes (Narrative) (Details) Sheet http://www.muellerwaterproducts.com/role/IncomeTaxesNarrativeDetails Income Taxes (Narrative) (Details) Details http://www.muellerwaterproducts.com/role/IncomeTaxesRateReconciliationTables 32 false false R33.htm 0000037 - Disclosure - Income Taxes Income Tax Rate Reconciliation (Details) Sheet http://www.muellerwaterproducts.com/role/IncomeTaxesIncomeTaxRateReconciliationDetails Income Taxes Income Tax Rate Reconciliation (Details) Details 33 false false R34.htm 0000038 - Disclosure - Borrowing Arrangements (Narrative) (Details) Sheet http://www.muellerwaterproducts.com/role/BorrowingArrangementsNarrativeDetails Borrowing Arrangements (Narrative) (Details) Details http://www.muellerwaterproducts.com/role/BorrowingArrangementsTables 34 false false R35.htm 0000039 - 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 35 false false R36.htm 0000042 - 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 36 false false R37.htm 0000043 - 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 37 false false R38.htm 0000044 - Disclosure - Stock-based Compensation Plans Grants Table (Details) Sheet http://www.muellerwaterproducts.com/role/StockbasedCompensationPlansGrantsTableDetails Stock-based Compensation Plans Grants Table (Details) Details 38 false false R39.htm 0000045 - 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 39 false false R40.htm 0000046 - 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 40 false false R41.htm 0000047 - 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 41 false false R42.htm 0000048 - 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 42 false false R43.htm 0000049 - Disclosure - Segment Information (Narrative) (Details) Sheet http://www.muellerwaterproducts.com/role/SegmentInformationNarrativeDetails Segment Information (Narrative) (Details) Details http://www.muellerwaterproducts.com/role/SegmentInformationTables 43 false false R44.htm 0000050 - 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 44 false false R45.htm 0000051 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.muellerwaterproducts.com/role/CommitmentsandContingenciesDetails Commitments and Contingencies (Details) Details http://www.muellerwaterproducts.com/role/CommitmentsandContingencies 45 false false R46.htm 0000052 - Disclosure - Subsequent Events (Details) Sheet http://www.muellerwaterproducts.com/role/SubsequentEventsDetails Subsequent Events (Details) Details http://www.muellerwaterproducts.com/role/SubsequentEvents 46 false false R47.htm 0000053 - Disclosure - Business Combinations and Asset Acquisitions (Details) Sheet http://www.muellerwaterproducts.com/role/BusinessCombinationsandAssetAcquisitionsDetails Business Combinations and Asset Acquisitions (Details) Details 47 false false All Reports Book All Reports [dq-0542-Deprecated-Concept] Concept LondonInterbankOfferedRateLIBORMember in us-gaap/2022 used in 3 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. mwa-20230331.htm 4 [dq-0542-Deprecated-Concept] Concept NotesReceivableRelatedPartiesNoncurrent in us-gaap/2022 used in 2 facts was deprecated in us-gaap/2023 as of 2023 and should not be used. mwa-20230331.htm 4 [dqc-0015-Negative-Values] Fact us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation has a value of -100000 which is less than zero. This element should not have a negative value. The preparer should consider if the value is input correctly for this assertion and, after considering the appropriateness of the input, if incorrect, input the amount as a positive (i.e., absolute) value and provide a negated label. The properties of this us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation fact are: Context: ib263e31ff24e4c7ea41ec84bdd622ebd_D20220101-20220331, Unit: usd, Rule Element Id: 240. mwa-20230331.htm 4 mwa-20230331.htm babc_mueller-sixthamendm.htm exhibit311ceo302certificat.htm exhibit312cfo302certificat.htm exhibit321ceo906certificat.htm exhibit322cfo906certificat.htm mwa-20230331.xsd mwa-20230331_cal.xml mwa-20230331_def.xml mwa-20230331_lab.xml mwa-20230331_pre.xml http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/dei/2022 true true