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Commitments and Contingencies (Narrative) (Details)	9 Months Ended
	Jun. 30, 2019
Officer [Member]
Loss Contingencies [Line Items]
Period in which payments of termination benefits required for employment terminated following change of control	2 years

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

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

X

- Definition

Period In Which Payments Of Termination Benefits Required For Employment Terminated Following Change of Control

+ References

No definition available.

+ Details

Name:	wwd_PeriodInWhichPaymentsOfTerminationBenefitsRequiredForEmploymentTerminatedFollowingChangeOfControl
Namespace Prefix:	wwd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_OfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: