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Accounts Receivable (Schedule of Accounts Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Accounts receivable $ 311,078us-gaap_AccountsAndOtherReceivablesNetCurrent $ 346,858us-gaap_AccountsAndOtherReceivablesNetCurrent
Allowance for uncollectible customer amounts (6,546)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (7,078)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Trade Accounts Receivable [Member]    
Accounts Receivable, Gross 280,905us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember		 291,584us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
Accounts Receivable from Chinese Financial Institution [Member]    
Accounts Receivable, Gross $ 36,719us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wwd_AccountsReceivableFromChineseFinancialInstitutionMember		 $ 62,352us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= wwd_AccountsReceivableFromChineseFinancialInstitutionMember