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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	$ 290.3us-gaap_SalesRevenueNet	$ 288.1us-gaap_SalesRevenueNet	$ 552.1us-gaap_SalesRevenueNet	$ 545.5us-gaap_SalesRevenueNet
2013	1.8mwa_IntercompanySales	1.7mwa_IntercompanySales	3.7mwa_IntercompanySales	3.3mwa_IntercompanySales
Operating income	25.6us-gaap_OperatingIncomeLoss	25.3us-gaap_OperatingIncomeLoss	33.7us-gaap_OperatingIncomeLoss	39.3us-gaap_OperatingIncomeLoss
Depreciation and amortization	14.4us-gaap_DepreciationDepletionAndAmortization	13.8us-gaap_DepreciationDepletionAndAmortization	28.7us-gaap_DepreciationDepletionAndAmortization	28.5us-gaap_DepreciationDepletionAndAmortization
Restructuring	0.7us-gaap_RestructuringCharges	2.7us-gaap_RestructuringCharges	8.9us-gaap_RestructuringCharges	2.8us-gaap_RestructuringCharges
Payments to Acquire Productive Assets	9.8us-gaap_PaymentsToAcquireProductiveAssets	10.8us-gaap_PaymentsToAcquireProductiveAssets	17.0us-gaap_PaymentsToAcquireProductiveAssets	18.3us-gaap_PaymentsToAcquireProductiveAssets
Total assets	1,208.5us-gaap_Assets		1,208.5us-gaap_Assets		1,317.1us-gaap_Assets
Intangible intangible assets, net	519.8us-gaap_IntangibleAssetsNetExcludingGoodwill		519.8us-gaap_IntangibleAssetsNetExcludingGoodwill		533.6us-gaap_IntangibleAssetsNetExcludingGoodwill
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Net sales, excluding intercompany	199.2us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	191.3us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	363.9us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	356.3us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember
2013	1.7mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	1.6mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	3.6mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	3.2mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember
Operating income	27.7us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	26.2us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	37.2us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	42.1us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember
Depreciation and amortization	10.7us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	10.1us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	21.3us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	21.2us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember
Restructuring	0.1us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	1.6us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	8.2us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	1.7us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember
Payments to Acquire Productive Assets	6.4us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	6.5us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	11.0us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember	10.9us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_MuellerCoMember
Anvil [Member]
Segment Reporting Information [Line Items]
Net sales, excluding intercompany	91.1us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	96.8us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	188.2us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	189.2us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember
2013	0.1mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	0.1mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	0.1mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	0.1mwa_IntercompanySales / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember
Operating income	7.2us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	7.5us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	14.4us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	14.8us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember
Depreciation and amortization	3.6us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	3.6us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	7.2us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	7.1us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember
Restructuring	0.2us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	1.1us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	0.2us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	1.1us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember
Payments to Acquire Productive Assets	3.4us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	4.1us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	6.0us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = mwa_AnvilMember	7.2us-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	0.1us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	0.1us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	0.2us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	0.2us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Restructuring	0.4us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	0us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	0.5us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	0us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Payments to Acquire Productive Assets	$ 0us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ 0.2us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ 0us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember	$ 0.2us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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