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Long-term Debt (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Debt financing costs	$ 0us-gaap_PaymentsOfDebtIssuanceCosts	$ 1,297us-gaap_PaymentsOfDebtIssuanceCosts
2008 Note Purchase Agreement [Member]
Issuance Date	Oct. 01, 2008
2009 Note Purchase Agreement [Member]
Issuance Date	Apr. 01, 2009
2013 Note Purchase Agreement [Member]
Issuance Date	Oct. 01, 2013
Face Amount	250,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = wwd_NotePurchaseAgreement2013Member
Debt financing costs		1,297us-gaap_PaymentsOfDebtIssuanceCosts / us-gaap_DebtInstrumentAxis = wwd_NotePurchaseAgreement2013Member
Series J Notes [Member]
Variable interest rate	1.48%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = wwd_SeriesJNotesMember
First Closing Notes [Member]
Issuance Date	Oct. 01, 2013
Second Closing Notes [Member]
Issuance Date	Nov. 15, 2013
Foreign Lines of Credit And Overdraft Facilities [Member]
Outstanding borrowings	0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_CreditFacilityAxis = wwd_ForeignLinesOfCreditAndOverdraftFacilitiesMember
Chinese Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	22,700us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wwd_ChineseCreditFacilityMember		22,700us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wwd_ChineseCreditFacilityMember
Outstanding borrowings	0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_CreditFacilityAxis = wwd_ChineseCreditFacilityMember
Chinese Credit Facility, RMB Denominated Loan [Member]
Variable Rate Basis	interest at the prevailing interest rate offered by the People's Bank of China on the date of borrowing, plus a margin equal to 25% of that prevailing rate
Chinese Credit Facility, USD Denominated Loan [Member]
Variable Rate Basis	interest at the lender's cost of borrowing rate at the date of borrowing, plus 3%
Revolving Credit Agreement [Member]
Variable Rate Basis	LIBOR
Line of Credit Facility, Expiration Date	Jul. 01, 2018
Line of Credit Facility, Maximum Borrowing Capacity	600,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wwd_RevolvingCreditAgreementMember
Outstanding borrowings	$ 200,000us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_CreditFacilityAxis = wwd_RevolvingCreditAgreementMember		$ 210,000us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_CreditFacilityAxis = wwd_RevolvingCreditAgreementMember
Credit facility effective interest rate on outstanding borrowing	1.22%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = wwd_RevolvingCreditAgreementMember		1.21%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = wwd_RevolvingCreditAgreementMember
Revolving Credit Agreement [Member] | Minimum [Member]
Basis Spread On Variable Rate	0.85%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = wwd_RevolvingCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Revolving Credit Agreement [Member] | Maximum [Member]
Basis Spread On Variable Rate	1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = wwd_RevolvingCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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- Definition

Fair value of the amount outstanding under the credit facility.

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- Definition

The effective interest rate at the end of the reporting period.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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