XML 152 R138.htm IDEA: XBRL DOCUMENT v3.20.2

Retirement Benefits (Schedule of Allocation of Plan Assets, Actual and Target Allocations) (Details) - Defined Benefit Pension Plan [Member]	Sep. 30, 2020	Sep. 30, 2019
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
United States [Member] | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	64.40%	60.60%
United States [Member] | Equity Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	41.70%	41.40%
United States [Member] | Equity Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	81.70%	81.40%
United States [Member] | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	35.00%	37.90%
United States [Member] | Debt Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	28.30%	28.60%
United States [Member] | Debt Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	48.30%	48.60%
United States [Member] | Other Investment Asset
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	0.60%	1.50%
Target Allocation Ranges	0.00%	0.00%
United States [Member] | Other Investment Asset | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
United States [Member] | Other Investment Asset | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
United Kingdom | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	39.60%	41.60%
United Kingdom | Equity Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	50.00%	30.00%
United Kingdom | Equity Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	90.00%	60.00%
United Kingdom | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	60.10%	57.80%
United Kingdom | Debt Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	45.00%	45.00%
United Kingdom | Debt Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	70.00%	70.00%
United Kingdom | Other Investment Asset
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	0.30%	0.60%
Target Allocation Ranges	0.00%	0.00%
United Kingdom | Other Investment Asset | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
United Kingdom | Other Investment Asset | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
Japan
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
Japan | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	39.70%	41.40%
Japan | Equity Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	36.00%	36.00%
Japan | Equity Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	44.00%	44.00%
Japan | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	59.40%	57.70%
Japan | Debt Securities | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	55.00%	55.00%
Japan | Debt Securities | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	63.00%	63.00%
Japan | Other Investment Asset
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	0.90%	0.90%
Japan | Other Investment Asset | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	0.00%	0.00%
Japan | Other Investment Asset | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	2.00%	2.00%

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

X

- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=wwd_DefinedBenefitPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=wwd_OtherInvestmentAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=country_JP
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: