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Segment Information (Consolidated Total Assets by Segment) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Assets $ 2,464,648us-gaap_Assets $ 2,397,202us-gaap_Assets
Property, plant and equipment, net 632,638us-gaap_PropertyPlantAndEquipmentNet 513,279us-gaap_PropertyPlantAndEquipmentNet
Aerospace [Member]    
Assets 1,511,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_AerospaceMember		 1,440,355us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_AerospaceMember
Energy [Member]    
Assets 622,546us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_EnergyMember		 610,345us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_EnergyMember
Unallocated Corporate [Member]    
Assets 253,410us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember		 273,510us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember
Property, plant and equipment, net 77,692us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember		 72,992us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember
Total of Reporting Segments [Member]    
Assets $ 2,133,546us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_TotalOfReportingSegmentsMember		 $ 2,050,700us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_TotalOfReportingSegmentsMember