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Basis of Presentation (Details) | Sep. 30, 2016
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Manufacturing Facility |
Property, Plant and Equipment |
Manufacturing Facilities | 45

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- Definition Number of manufacturing facilities + References No definition available. + Details
Name: | dw_NumberOfManufacturingFacilities
Namespace Prefix: | dw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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