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Property, Plant, and Equipment, Net (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Sep. 30, 2013
--- | --- | ---
Construction in progress | $ 125,761 | $ 81,428
Second Campus Rockford Illinois [Member] |  |
Construction in progress | 36,201 | 15,691
Capitalized interest | 1,262 | 444
New Campus Fort Collins Colorado [Member] |  |
Construction in progress | 18,141 | 10,514
Capitalized interest | 864 | 394
Building Site Niles Illinois [Member] |  |
Construction in progress | 18,887 | 12,067
Capitalized interest | $ 365 | $ 0

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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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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Namespace Prefix: | wwd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant