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Segment Reporting (Schedule Of Information Relating To Segments) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information                      
Net sales to external customers $ 289,351,000us-gaap_SalesRevenueGoodsNet $ 294,271,000us-gaap_SalesRevenueGoodsNet $ 321,783,000us-gaap_SalesRevenueGoodsNet $ 285,377,000us-gaap_SalesRevenueGoodsNet $ 224,947,000us-gaap_SalesRevenueGoodsNet $ 250,851,000us-gaap_SalesRevenueGoodsNet $ 287,192,000us-gaap_SalesRevenueGoodsNet $ 252,586,000us-gaap_SalesRevenueGoodsNet $ 1,190,782,000us-gaap_SalesRevenueGoodsNet $ 1,015,576,000us-gaap_SalesRevenueGoodsNet $ 901,123,000us-gaap_SalesRevenueGoodsNet [1]
Operating profit (loss)                 95,487,000us-gaap_OperatingIncomeLoss 78,298,000us-gaap_OperatingIncomeLoss 58,132,000us-gaap_OperatingIncomeLoss [2]
Total assets 543,841,000us-gaap_Assets       453,184,000us-gaap_Assets       543,841,000us-gaap_Assets 453,184,000us-gaap_Assets 373,868,000us-gaap_Assets [3]
Expenditures for long-lived assets                 147,445,000dw_AdditionToNoncurrentAssets 37,671,000dw_AdditionToNoncurrentAssets 33,632,000dw_AdditionToNoncurrentAssets [4]
Depreciation and amortization                 32,596,000us-gaap_DepreciationDepletionAndAmortization 27,500,000us-gaap_DepreciationDepletionAndAmortization 25,665,000us-gaap_DepreciationDepletionAndAmortization
Purchase of long-lived assets as part of business acquisition                 105,000,000dw_AdditionsToNoncurrentAssetsAsPartOfBusinessAcquisition 4,800,000dw_AdditionsToNoncurrentAssetsAsPartOfBusinessAcquisition 1,500,000dw_AdditionsToNoncurrentAssetsAsPartOfBusinessAcquisition
RV Segment                      
Segment Reporting Information                      
Net sales to external customers                 1,074,448,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 893,694,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 780,925,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 [1]
Operating profit (loss)                 86,571,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 68,248,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 47,172,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 [2]
Total assets 451,264,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		       306,139,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		       451,264,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 306,139,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 281,728,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 [3]
Expenditures for long-lived assets                 145,406,000dw_AdditionToNoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 34,989,000dw_AdditionToNoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 30,893,000dw_AdditionToNoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 [4]
Depreciation and amortization                 29,933,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 24,615,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 22,750,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember
Consolidated net sales, percentage                 90.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 88.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 87.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember
RV Segment | Thor Industries, Inc. [Member]                      
Segment Reporting Information                      
Consolidated net sales, percentage                 33.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= dw_ThorIndustriesIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 34.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= dw_ThorIndustriesIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 37.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= dw_ThorIndustriesIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember
RV Segment | Berkshire Hathaway Inc. [Member]                      
Segment Reporting Information                      
Consolidated net sales, percentage                 28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= dw_BerkshireHathawayIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= dw_BerkshireHathawayIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember		 27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= dw_BerkshireHathawayIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RVSegmentMember
Travel Trailer And Fifth-Wheels                      
Segment Reporting Information                      
Net sales to external customers                 844,096,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_TravelTrailerAndFifthWheelsMember		 727,783,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_TravelTrailerAndFifthWheelsMember		 653,478,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_TravelTrailerAndFifthWheelsMember
Motorhomes                      
Segment Reporting Information                      
Net sales to external customers                 67,774,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MotorhomesMember		 47,937,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MotorhomesMember		 34,612,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MotorhomesMember
RV Aftermarket                      
Segment Reporting Information                      
Net sales to external customers                 49,570,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RvAftermarketMember		 25,334,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RvAftermarketMember		 19,119,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RvAftermarketMember
Adjacent Industries                      
Segment Reporting Information                      
Net sales to external customers                 113,008,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RvAdjacentIndustriesMember		 92,640,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RvAdjacentIndustriesMember		 73,716,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_RvAdjacentIndustriesMember
MH Segment                      
Segment Reporting Information                      
Net sales to external customers                 116,334,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 121,882,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 120,198,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 [1]
Operating profit (loss)                 10,870,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 11,926,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 12,416,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 [2]
Total assets 29,482,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		       32,948,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		       29,482,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 32,948,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 35,668,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 [3]
Expenditures for long-lived assets                 2,039,000dw_AdditionToNoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 2,682,000dw_AdditionToNoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 2,739,000dw_AdditionToNoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 [4]
Depreciation and amortization                 2,568,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 2,806,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 2,822,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember
Consolidated net sales, percentage                 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember		 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= dw_MHSegmentMember
Manufactured Housing OEMs                      
Segment Reporting Information                      
Net sales to external customers                 77,421,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_ManufacturedHousingOemsMember		 80,245,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_ManufacturedHousingOemsMember		 80,392,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_ManufacturedHousingOemsMember
Manufactured Housing Aftermarket                      
Segment Reporting Information                      
Net sales to external customers                 14,186,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_ManufacturedHousingAftermarketMember		 13,719,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_ManufacturedHousingAftermarketMember		 13,110,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_ManufacturedHousingAftermarketMember
Adjacent Industries                      
Segment Reporting Information                      
Net sales to external customers                 24,727,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_ManufacturedHousingAdjacentIndustriesMember		 27,918,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_ManufacturedHousingAdjacentIndustriesMember		 26,696,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= dw_ManufacturedHousingAdjacentIndustriesMember
Operating Segments [Member]                      
Segment Reporting Information                      
Net sales to external customers                 1,190,782,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 1,015,576,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 901,123,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 [1]
Operating profit (loss)                 97,441,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 80,174,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 59,588,000us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 [2]
Total assets 480,746,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		       339,087,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		       480,746,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 339,087,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 317,396,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 [3]
Expenditures for long-lived assets                 147,445,000dw_AdditionToNoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 37,671,000dw_AdditionToNoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 33,632,000dw_AdditionToNoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 [4]
Depreciation and amortization                 32,501,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 27,421,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 25,572,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember
Corporate and Other [Member]                      
Segment Reporting Information                      
Operating profit (loss)                 (1,954,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 (1,876,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 (1,456,000)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 [2]
Total assets 63,095,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		       114,097,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		       63,095,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 114,097,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 56,472,000us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 [3]
Depreciation and amortization                 $ 95,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ 79,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ 93,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
[1] (a) Thor Industries, Inc., a customer of the RV Segment, accounted for 33 percent, 34 percent and 37 percent of the Company’s consolidated net sales for the years ended December 31, 2014, 2013 and 2012, respectively. Berkshire Hathaway Inc. (through its subsidiaries Forest River, Inc. and Clayton Homes, Inc.), a customer of both segments, accounted for 28 percent, 28 percent and 27 percent of the Company’s consolidated net sales for the years ended December 31, 2014, 2013 and 2012, respectively. No other customer accounted for more than 10 percent of consolidated net sales in the years ended December 31, 2014, 2013 and 2012.
[2] (b) Certain general and administrative expenses are allocated between the segments based upon net sales or operating profit, depending upon the nature of the expense.
[3] (c) Segment assets include accounts receivable, inventories, fixed assets, goodwill and other intangible assets. Corporate and other assets include cash and cash equivalents, prepaid expenses and other current assets, deferred taxes, and other assets.
[4] (d) Expenditures for long-lived assets include capital expenditures, as well as fixed assets, goodwill and other intangible assets purchased as part of the acquisition of businesses. The Company purchased $105.0 million, $4.8 million and $1.5 million of long-lived assets, as part of the acquisitions of businesses in the years ended December 31, 2014, 2013 and 2012, respectively.