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Goodwill (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014
Goodwill, Beginning Balance | $ 559,724 us-gaap_Goodwill
Effects of Currency Translation | (1,765)us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending Balance | 557,959 us-gaap_Goodwill
Aerospace [Member] |
Goodwill, Beginning Balance | 455,423 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wwd_AerospaceMember
Effects of Currency Translation | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = wwd_AerospaceMember
Goodwill, Ending Balance | 455,423 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wwd_AerospaceMember
Energy [Member] |
Goodwill, Beginning Balance | 104,301 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wwd_EnergyMember
Effects of Currency Translation | (1,765)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = wwd_EnergyMember
Goodwill, Ending Balance | $ 102,536 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = wwd_EnergyMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillTranslationAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wwd_AerospaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wwd_EnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |