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Property, Plant, and Equipment, Net (Narrative) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014
Construction in progress | $ 221,458,000 us-gaap_ConstructionInProgressGross | $ 223,958,000 us-gaap_ConstructionInProgressGross
Property, Plant and Equipment, Net | 566,273,000 us-gaap_PropertyPlantAndEquipmentNet | 513,279,000 us-gaap_PropertyPlantAndEquipmentNet
Second Campus Rockford Illinois [Member] |  |
Construction in progress | 102,763,000 us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_SecondCampusRockfordIllinoisMember | 85,283,000 us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_SecondCampusRockfordIllinoisMember
Capitalized interest | 3,947,000 wwd_CapitalizedInterestIncludedInConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_SecondCampusRockfordIllinoisMember | 2,963,000 wwd_CapitalizedInterestIncludedInConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_SecondCampusRockfordIllinoisMember
New Campus Fort Collins Colorado [Member] |  |
Construction in progress | 49,058,000 us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_NewCampusFortCollinsColoradoMember | 37,268,000 us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_NewCampusFortCollinsColoradoMember
Capitalized interest | 2,331,000 wwd_CapitalizedInterestIncludedInConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_NewCampusFortCollinsColoradoMember | 2,392,000 wwd_CapitalizedInterestIncludedInConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_NewCampusFortCollinsColoradoMember
Building Site Niles Illinois [Member] |  |
Construction in progress | 2,019,000 us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_BuildingSiteNilesIllinoisMember | 55,629,000 us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_BuildingSiteNilesIllinoisMember
Construction in Progress [Member] |  |
Contruction in progress placed into service | (63,000,000)us-gaap_PropertyPlantAndEquipmentTransfersAndChanges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |
Building and Building Improvements [Member] |  |
Additions to property, plant and equipment | 63,000,000 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember |
Assets Held-for-sale [Member] | Land and Building [Member] |  |
Property, Plant and Equipment, Net | $ 2,280,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndBuildingMember | $ 2,465,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndBuildingMember

X
- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -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 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition Amount of reclassification, impairment, donation, or other change to long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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- Definition The amount of interest that was capitalized on capital projects that have not been completed and assets being constructed that are not ready to be placed into service. + References No definition available. + Details
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