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Goodwill (Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 31, 2015
Goodwill, Beginning Balance $ 559,724us-gaap_Goodwill
Effects of Currency Translation (3,224)us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending Balance 556,500us-gaap_Goodwill
Aerospace [Member]  
Goodwill, Beginning Balance 455,423us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_AerospaceMember
Effects of Currency Translation 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_AerospaceMember
Goodwill, Ending Balance 455,423us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_AerospaceMember
Energy [Member]  
Goodwill, Beginning Balance 104,301us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_EnergyMember
Effects of Currency Translation (3,224)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_EnergyMember
Goodwill, Ending Balance $ 101,077us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= wwd_EnergyMember