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Basis of Presentation (Details) (Manufacturing Facility)	Mar. 31, 2015
Manufacturing Facility
Property, Plant and Equipment
Manufacturing Facilities	38

X

- 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

X

- Details

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