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Credit Facilities, Short-term Borrowings and Long-term Debt (Short-term Borrowings and Availability Under Various Short-term Credit Facilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Line Of Credit Facility [Line Items]
Total availability	$ 1,008,078
Outstanding letters of credit and guarantees	(12,027)
Remaining availability	996,051
Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Total availability	1,000,000
Outstanding letters of credit and guarantees	(11,771)
Outstanding borrowings	0	$ (262,297)
Remaining availability	988,229
Foreign Lines Of Credit And Overdraft Facilities [Member]
Line Of Credit Facility [Line Items]
Total availability	7,567
Remaining availability	7,567
Foreign Performance Guarantee Facilities [Member]
Line Of Credit Facility [Line Items]
Total availability	511
Outstanding letters of credit and guarantees	(256)
Remaining availability	$ 255

X

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

+ Details

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

X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

+ Details

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

X

- Definition

The total amount of the contingent obligation under letters of credit and guarantees outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_CreditFacilityAxis=wwd_ForeignPerformanceGuaranteeFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: