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Financial Instruments and Fair Value Measurements (Narrative) (Details) (USD $)	6 Months Ended	12 Months Ended
	Mar. 31, 2015	Sep. 30, 2014
Financial liability on recurring basis	0us-gaap_LiabilitiesFairValueDisclosure	0us-gaap_LiabilitiesFairValueDisclosure
Long Term Note Receivable From Municipality Within The State Of Illinois [Member]
Interest rate used to estimate fair value	3.10%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = wwd_LongTermNoteReceivableFromMunicipalityWithinStateOfIllinoisMember	3.20%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = wwd_LongTermNoteReceivableFromMunicipalityWithinStateOfIllinoisMember
Long Term Note Receivable From Municipality Within The State Of Colorado [Member]
Interest rate used to estimate fair value	3.10%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = wwd_LongTermNoteReceivableFromMunicipalityWithinStateOfColoradoMember	3.20%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = wwd_LongTermNoteReceivableFromMunicipalityWithinStateOfColoradoMember
Borrowings [Member]
Interest rate used to estimate fair value	2.30%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_BorrowingsMember	2.40%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_BorrowingsMember

X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Balance Type:	credit
Period Type:	instant

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- Details

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Data Type:	na
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X

- Details

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