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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Unrecognized Tax Benefits $ 2.6us-gaap_UnrecognizedTaxBenefits $ 2.7us-gaap_UnrecognizedTaxBenefits
Inventories:    
Purchased components and raw material 76.5us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves 72.0us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves
Work in process 39.7us-gaap_InventoryWorkInProcessNetOfReserves 34.5us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 107.1us-gaap_InventoryFinishedGoodsNetOfReserves 91.5us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories, net 223.3us-gaap_InventoryNet 198.0us-gaap_InventoryNet
Property, plant and equipment:    
Land 9.4us-gaap_Land 9.6us-gaap_Land
Buildings 77.3us-gaap_BuildingsAndImprovementsGross 78.0us-gaap_BuildingsAndImprovementsGross
Machinery and equipment 340.7us-gaap_MachineryAndEquipmentGross 332.9us-gaap_MachineryAndEquipmentGross
Construction in progress 16.7us-gaap_ConstructionInProgressGross 18.7us-gaap_ConstructionInProgressGross
Property, plant and equipment, gross 444.1us-gaap_PropertyPlantAndEquipmentGross 439.2us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (299.4)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (292.9)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment net 144.7us-gaap_PropertyPlantAndEquipmentNet 146.3us-gaap_PropertyPlantAndEquipmentNet
Other current liabilities:    
Compensation and benefits 27.9us-gaap_AccruedEmployeeBenefitsCurrent 39.5us-gaap_AccruedEmployeeBenefitsCurrent
Customer rebates 9.1mwa_AccruedRebate 16.9mwa_AccruedRebate
Interest 0.8us-gaap_InterestPayableCurrent 10.7us-gaap_InterestPayableCurrent
Taxes other than income taxes 4.3us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 4.7us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Warranty 2.5us-gaap_ProductWarrantyAccrual 2.6us-gaap_ProductWarrantyAccrual
Environmental 2.2us-gaap_AccruedEnvironmentalLossContingenciesCurrent 0.1us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Income taxes 0us-gaap_AccruedIncomeTaxesCurrent 0.7us-gaap_AccruedIncomeTaxesCurrent
Restructuring 0.2us-gaap_RestructuringReserve 0.9us-gaap_RestructuringReserve
Other 5.6us-gaap_OtherLiabilities 6.1us-gaap_OtherLiabilities
Other current liabilities $ 52.6us-gaap_OtherLiabilitiesCurrent $ 82.2us-gaap_OtherLiabilitiesCurrent