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
Revolving Credit Agreement [Member]
Maximum borrowing capacity	600,000
Option to increase maximum borrowings to this amount	800,000
Line of Credit Facility, Expiration Date	Jul. 01, 2018
Variable Rate Basis	LIBOR
Credit facility effective interest rate on outstanding borrowing	1.22%	1.21%
Outstanding borrowings	200,000	210,000
Revolving Credit Agreement [Member] \| Minimum [Member]
Basis Spread On Variable Rate	0.85%
Revolving Credit Agreement [Member] \| Maximum [Member]
Basis Spread On Variable Rate	1.65%
Chinese Credit Facility [Member]
Maximum borrowing capacity	22,700	22,700
Outstanding borrowings	$ 0
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%

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

No definition available.

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Period Type:	duration

- 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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Period Type:	duration

- 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

- 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

Name:	us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

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Namespace Prefix:	wwd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=wwd_ChineseCreditFacilityMember
Namespace Prefix:
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- Details

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Balance Type:
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- Details

Name:	us-gaap_CreditFacilityAxis=wwd_ForeignLinesOfCreditAndOverdraftFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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