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Revenue (Narrative - Performance Obligations) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Remaining performance obligation amount	$ 1,587,816	$ 1,527,437
Material Rights [Member]
Remaining performance obligation amount	$ 454,585

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

+ Details

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

X

- Details

Name:	srt_ProductOrServiceAxis=wwd_MaterialRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: