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Property, Plant, and Equipment, Net (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2015	Sep. 30, 2014
Construction in progress	$ 278,365us-gaap_ConstructionInProgressGross	$ 223,958us-gaap_ConstructionInProgressGross
Property, Plant and Equipment, Net	632,638us-gaap_PropertyPlantAndEquipmentNet	513,279us-gaap_PropertyPlantAndEquipmentNet
Second Campus Rockford Illinois [Member]
Construction in progress	123,311us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_SecondCampusRockfordIllinoisMember	85,283us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_SecondCampusRockfordIllinoisMember
Capitalized interest	4,935wwd_CapitalizedInterestIncludedInConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_SecondCampusRockfordIllinoisMember	2,963wwd_CapitalizedInterestIncludedInConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_SecondCampusRockfordIllinoisMember
New Campus Fort Collins Colorado [Member]
Construction in progress	84,467us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_NewCampusFortCollinsColoradoMember	37,268us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_NewCampusFortCollinsColoradoMember
Capitalized interest	3,029wwd_CapitalizedInterestIncludedInConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_NewCampusFortCollinsColoradoMember	2,392wwd_CapitalizedInterestIncludedInConstructionInProgress / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_NewCampusFortCollinsColoradoMember
Building Site Niles Illinois [Member]
Construction in progress	964us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_BuildingSiteNilesIllinoisMember	55,629us-gaap_ConstructionInProgressGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = wwd_BuildingSiteNilesIllinoisMember
Building and Building Improvements [Member]
Contruction in progress placed into service	68,700us-gaap_PropertyPlantAndEquipmentTransfersAndChanges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember
Assets Held-for-sale [Member] | Land and Building [Member]
Property, Plant and Equipment, Net	$ 677us-gaap_PropertyPlantAndEquipmentNet / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndBuildingMember	$ 2,465us-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

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X

- 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

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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

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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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