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Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | $ 290.3 us-gaap_SalesRevenueNet | $ 288.1 us-gaap_SalesRevenueNet | $ 552.1 us-gaap_SalesRevenueNet | $ 545.5 us-gaap_SalesRevenueNet |
2013 | 1.8 mwa_IntercompanySales | 1.7 mwa_IntercompanySales | 3.7 mwa_IntercompanySales | 3.3 mwa_IntercompanySales |
Operating income | 25.6 us-gaap_OperatingIncomeLoss | 25.3 us-gaap_OperatingIncomeLoss | 33.7 us-gaap_OperatingIncomeLoss | 39.3 us-gaap_OperatingIncomeLoss |
Depreciation and amortization | 14.4 us-gaap_DepreciationDepletionAndAmortization | 13.8 us-gaap_DepreciationDepletionAndAmortization | 28.7 us-gaap_DepreciationDepletionAndAmortization | 28.5 us-gaap_DepreciationDepletionAndAmortization |
Restructuring | 0.7 us-gaap_RestructuringCharges | 2.7 us-gaap_RestructuringCharges | 8.9 us-gaap_RestructuringCharges | 2.8 us-gaap_RestructuringCharges |
Payments to Acquire Productive Assets | 9.8 us-gaap_PaymentsToAcquireProductiveAssets | 10.8 us-gaap_PaymentsToAcquireProductiveAssets | 17.0 us-gaap_PaymentsToAcquireProductiveAssets | 18.3 us-gaap_PaymentsToAcquireProductiveAssets |
Total assets | 1,208.5 us-gaap_Assets |  | 1,208.5 us-gaap_Assets |  | 1,317.1 us-gaap_Assets
Intangible intangible assets, net | 519.8 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 519.8 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 533.6 us-gaap_IntangibleAssetsNetExcludingGoodwill
Mueller Co. [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | 199.2 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 191.3 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 363.9 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 356.3 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember |
2013 | 1.7 mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 1.6 mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 3.6 mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 3.2 mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember |
Operating income | 27.7 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 26.2 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 37.2 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 42.1 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember |
Depreciation and amortization | 10.7 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 10.1 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 21.3 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 21.2 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember |
Restructuring | 0.1 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 1.6 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 8.2 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 1.7 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember |
Payments to Acquire Productive Assets | 6.4 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 6.5 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 11.0 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember | 10.9 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember |
Anvil [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales, excluding intercompany | 91.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 96.8 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 188.2 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 189.2 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember |
2013 | 0.1 mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 0.1 mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 0.1 mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 0.1 mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember |
Operating income | 7.2 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 7.5 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 14.4 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 14.8 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember |
Depreciation and amortization | 3.6 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 3.6 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 7.2 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 7.1 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember |
Restructuring | 0.2 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 1.1 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 0.2 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 1.1 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember |
Payments to Acquire Productive Assets | 3.4 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 4.1 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 6.0 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember | 7.2 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember |
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income | (9.3)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (8.4)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (17.9)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (17.6)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Depreciation and amortization | 0.1 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 0.1 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 0.2 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 0.2 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Restructuring | 0.4 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 0 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 0.5 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 0 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Payments to Acquire Productive Assets | $ 0 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 0.2 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 0 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 0.2 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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