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Acquisitions, Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 0 Months Ended
Apr. 30, 2014
Jun. 30, 2014
Dec. 31, 2014
Jan. 16, 2015
Dec. 31, 2014
Mar. 14, 2014
Mar. 31, 2014
Mar. 31, 2015
Feb. 27, 2014
Apr. 24, 2015
Business Acquisition                    
Long-term purchase commitment, time period 6                  
Pre-tax loss on sale of business assets   $ 2,000,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment                
Proceeds from sale of aluminum extrusion assets, cash received 300,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment                  
Proceeds from sale of aluminum extrusion assets, note receivable 7,200,000us-gaap_ReceivableWithImputedInterestFaceAmount                  
Term of note receivable 4 years                  
Proceeds from first installment of note receivable     1,800,000us-gaap_ProceedsFromCollectionOfNotesReceivable              
Present value of note receivable 6,400,000us-gaap_ReceivableWithImputedInterestNetAmount             5,000,000us-gaap_ReceivableWithImputedInterestNetAmount    
EA Technologies                    
Business Acquisition                    
Annual sales of acquired entity       17,000,000us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
/ us-gaap_BusinessAcquisitionAxis
= dw_EATechnologiesMember
           
Total fair value of consideration given       9,200,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= dw_EATechnologiesMember
           
Cash consideration       9,248,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= dw_EATechnologiesMember
6,600,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= dw_EATechnologiesMember
         
Star Designs, LLC                    
Business Acquisition                    
Annual sales of acquired entity     10,000,000us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
/ us-gaap_BusinessAcquisitionAxis
= dw_StarDesignsLLCMember
             
Total fair value of consideration given           12,200,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= dw_StarDesignsLLCMember
       
Cash consideration             12,232,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= dw_StarDesignsLLCMember
     
Star Designs, LLC | Customer Relationships                    
Business Acquisition                    
Estimated useful life in years               14 years    
Innovative Design Solutions, Inc                    
Business Acquisition                    
Annual sales of acquired entity     19,000,000us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
/ us-gaap_BusinessAcquisitionAxis
= dw_InnovativeDesignSolutionsIncMember
             
Total fair value of consideration given                 36,624,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= dw_InnovativeDesignSolutionsIncMember
 
Cash consideration                 34,175,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= dw_InnovativeDesignSolutionsIncMember
 
Revenue from acquired entity to company for last annual period     15,000,000dw_BusinessAcquisitionRevenueFromCompanyReportedByAcquiredEntityForLastAnnualPeriod
/ us-gaap_BusinessAcquisitionAxis
= dw_InnovativeDesignSolutionsIncMember
             
Business combination consideration transferred total, less future payments                 35,900,000dw_BusinessCombinationConsiderationTransferredTotalLessFuturePayments
/ us-gaap_BusinessAcquisitionAxis
= dw_InnovativeDesignSolutionsIncMember
 
Payment term for remaining consideration to be paid                 3 years  
Innovative Design Solutions, Inc | Patents                    
Business Acquisition                    
Estimated useful life in years               10 years    
Innovative Design Solutions, Inc | Customer Relationships                    
Business Acquisition                    
Estimated useful life in years               12 years    
Subsequent Event | Spectal Industries                    
Business Acquisition                    
Annual sales of acquired entity                   25,000,000us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
/ us-gaap_BusinessAcquisitionAxis
= dw_SpectalIndustriesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Total fair value of consideration given                   $ 22,300,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= dw_SpectalIndustriesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember