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Discontinued Operations, Assets Held for Sale and Divestitures (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Restructuring | $ 0.7 us-gaap_RestructuringCharges | $ 2.7 us-gaap_RestructuringCharges | $ 8.9 us-gaap_RestructuringCharges | $ 2.8 us-gaap_RestructuringCharges |
Proceeds from Sale of Productive Assets |  |  | 4.8 us-gaap_ProceedsFromSaleOfProductiveAssets | 0.3 us-gaap_ProceedsFromSaleOfProductiveAssets |
Net sales | 290.3 us-gaap_SalesRevenueNet | 288.1 us-gaap_SalesRevenueNet | 552.1 us-gaap_SalesRevenueNet | 545.5 us-gaap_SalesRevenueNet |
St. Jerome [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Restructuring |  |  | 7.2 us-gaap_RestructuringCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mwa_QuebecMember |  |
Disposal Group, Including Discontinued Operation, Operating Income (Loss) |  |  | 2.5 us-gaap_AssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mwa_QuebecMember |  |
Environmental Remediation Expense |  |  | 2.3 us-gaap_EnvironmentalRemediationExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mwa_QuebecMember |  |
Severance Costs |  |  | 2.4 us-gaap_SeveranceCosts1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mwa_QuebecMember |  |
Net sales |  |  |  |  | $ 11.5 us-gaap_SalesRevenueNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mwa_QuebecMember

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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