XML 84 R73.htm IDEA: XBRL DOCUMENT v3.19.2

Financial Instruments and Fair Value Measurements (Narrative) (Details) - USD ($)	Jun. 30, 2019	Sep. 30, 2018
Investments in Short-Term Time Deposits [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate used to measure short-term time deposits	6.3	6.3
Long Term Notes Receivable From Municipalities [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate used to measure municipal notes	2.0	3.1
Long-Term Debt [Member] | Measurement Input, Discount Rate [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate used to measure long-term debt	2.8	3.5
Cash [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 54,392,000	$ 59,838,000
Investments in Reverse Repurchase Agreements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	90,000	4,582,000
Investments in Term Deposits with Foreign Banks [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 8,820,000	19,174,000
Restricted Investments in Term Deposits with Foreign Banks [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		$ 3,635,000

X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Value of input used to measure long-term debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_LongTermDebtMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Value of input used to measure municipal notes

+ References

No definition available.

+ Details

Name:	wwd_MunicipalNotesMeasurementInput
Namespace Prefix:	wwd_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Value of input used to measure short term time deposits

+ References

No definition available.

+ Details

Name:	wwd_ShortTermTimeDepositsMeasurementInput
Namespace Prefix:	wwd_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=wwd_InvestmentsInShortTermTimeDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=wwd_LongTermNotesReceivableFromMunicipalitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis=us-gaap_CashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis=wwd_InvestmentsInReverseRepurchaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis=wwd_InvestmentsInTermDepositsWithForeignBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis=wwd_RestrictedInvestmentsInTermDepositsWithForeignBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: