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Credit Facilities, Short-term Borrowings (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014
Foreign Lines of Credit And Overdraft Facilities [Member] |  |
Outstanding borrowings | $ 0 us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_CreditFacilityAxis = wwd_ForeignLinesOfCreditAndOverdraftFacilitiesMember |
Revolving Credit Agreement [Member] |  |
Maximum borrowing capacity | 600,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wwd_RevolvingCreditAgreementMember |
Option to increase maximum borrowings to this amount | 800,000 wwd_LineOfCreditFacilityOptionToIncreaseMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wwd_RevolvingCreditAgreementMember |
Line of Credit Facility, Expiration Date | Jul. 01, 2018 |
Variable Rate Basis | LIBOR |
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
Outstanding borrowings | 200,000 us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / us-gaap_CreditFacilityAxis = wwd_RevolvingCreditAgreementMember | 210,000 us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding / 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 |
Chinese Credit Facility [Member] |  |
Maximum borrowing capacity | 22,700 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wwd_ChineseCreditFacilityMember | 22,700 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = wwd_ChineseCreditFacilityMember
Outstanding borrowings | $ 0 us-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% |

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- 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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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | na
Period Type: | instant

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility that the borrower has the option to increase to subject to lenders' participation. + References No definition available. + Details
Name: | wwd_LineOfCreditFacilityOptionToIncreaseMaximumBorrowingCapacity
Namespace Prefix: | wwd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Period Type: |