XML 67 R54.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Operations and summary of significant accounting policies (Schedule of property, plant, and equipment useful lives) (Details) | 12 Months Ended
--- | ---
Sep. 30, 2017
Enterprise Resource Planning system [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 10 years
Minimum [Member] | Land Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Minimum [Member] | Building and Building Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Minimum [Member] | Leasehold Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 1 year
Minimum [Member] | Machinery and Production Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Minimum [Member] | Computer Equipment and Software [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Minimum [Member] | Office furniture and equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Minimum [Member] | Other Capitalized Property Plant and Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Minimum [Member] | Computer Equipment and Software, Excluding ERP system [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Maximum [Member] | Land Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 20 years
Maximum [Member] | Building and Building Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 40 years
Maximum [Member] | Leasehold Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 10 years
Maximum [Member] | Machinery and Production Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 20 years
Maximum [Member] | Computer Equipment and Software [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 10 years
Maximum [Member] | Office furniture and equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 13 years
Maximum [Member] | Other Capitalized Property Plant and Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 13 years
Maximum [Member] | Computer Equipment and Software, Excluding ERP system [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 5 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
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |