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Financial Instruments and Fair Value Measurements (Narrative) (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Sep. 30, 2013
Financial liability on recurring basis | $ 0 | $ 0
Long Term Note Receivable From Municipality Within The State Of Illinois [Member] |  |
Note receivable from municipality, interest rate used to estimate fair value | 3.30% | 4.30%
Long Term Note Receivable From Municipality Within The State Of Colorado [Member] |  |
Note receivable from municipality, interest rate used to estimate fair value | 3.30% | 4.30%
Borrowings [Member] |  |
Interest rate used to estimate fair value | 2.40% | 2.00%

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- 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=25499696&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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=25499696&loc=d3e19207-110258 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the weighted average interest rates used to estimate fair value of long-term notes receivable calculated based on a model that discounted future principal and interest payments received at interest rates available to the company at the end of the period for similar notes of the same maturity. + References No definition available. + Details
Name: | wwd_NoteReceivableWeightedAverageInterestRateUsedToEstimateFairValue
Namespace Prefix: | wwd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant