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v3.20.2

Operations and Summary of Significant Accounting Policies (Schedule of Property, Plant and Equipment Useful Lives) (Details) | 12 Months Ended
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Sep. 30, 2020
Land Improvements [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Land Improvements [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 20 years
Building and Building Improvements [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Building and Building Improvements [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 40 years
Leasehold Improvements [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 1 year
Leasehold Improvements [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 10 years
Machinery and Production Equipment [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Machinery and Production Equipment [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 20 years
Computer Equipment and Software [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 1 year
Computer Equipment and Software [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 10 years
Office furniture and equipment [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Office furniture and equipment [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 10 years
Other [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Other [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 10 years
Computer Equipment and Software, Excluding ERP system [Member] | Minimum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Computer Equipment and Software, Excluding ERP system [Member] | Maximum [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 5 years
Enterprise Resource Planning system [Member] |
Property Plant And Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 10 years

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

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=wwd_ComputerEquipmentAndSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |