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Financial Instruments and Fair Value Measurements (Financial Assets that are Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Equity securities	$ 10,498us-gaap_TradingSecurities	$ 9,645us-gaap_TradingSecurities
Total financial assets	68,960us-gaap_AssetsFairValueDisclosureRecurring	124,932us-gaap_AssetsFairValueDisclosureRecurring
Fair Value, Inputs, Level 1 [Member]
Equity securities	10,498us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	9,645us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total financial assets	68,960us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	124,932us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]
Equity securities	0us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total financial assets	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]
Equity securities	0us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Total financial assets	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Cash [Member]
Cash and cash equivalents	51,041us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_CashMember	92,590us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_CashMember
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	51,041us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_CashMember	92,590us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_CashMember
Cash [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_CashMember	0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_CashMember
Cash [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_CashMember	0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_CashMember
Investments in Money Market Funds [Member]
Cash and cash equivalents	12us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_MoneyMarketFundsMember	11,210us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_MoneyMarketFundsMember
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	12us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_MoneyMarketFundsMember	11,210us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_MoneyMarketFundsMember
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_MoneyMarketFundsMember	0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_MoneyMarketFundsMember
Investments in Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_MoneyMarketFundsMember	0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_MoneyMarketFundsMember
Investments in Reverse Repurchase Agreements [Member]
Cash and cash equivalents	7,409us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = wwd_InvestmentsInReverseRepurchaseAgreementsMember	11,487us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = wwd_InvestmentsInReverseRepurchaseAgreementsMember
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	7,409us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = wwd_InvestmentsInReverseRepurchaseAgreementsMember	11,487us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = wwd_InvestmentsInReverseRepurchaseAgreementsMember
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = wwd_InvestmentsInReverseRepurchaseAgreementsMember	0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = wwd_InvestmentsInReverseRepurchaseAgreementsMember
Investments in Reverse Repurchase Agreements [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	$ 0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = wwd_InvestmentsInReverseRepurchaseAgreementsMember	$ 0us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = wwd_InvestmentsInReverseRepurchaseAgreementsMember

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

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- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6507016

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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