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Segment reporting (Summary of segment information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 31, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 31, 2014 segment | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,951,446 us-gaap_SalesRevenueGoodsNet | $ 1,990,658 us-gaap_SalesRevenueGoodsNet | $ 2,048,247 us-gaap_SalesRevenueGoodsNet | $ 1,813,095 us-gaap_SalesRevenueGoodsNet | $ 1,924,104 us-gaap_SalesRevenueGoodsNet | $ 1,961,536 us-gaap_SalesRevenueGoodsNet | $ 1,976,299 us-gaap_SalesRevenueGoodsNet | $ 1,486,815 us-gaap_SalesRevenueGoodsNet | $ 7,803,446 us-gaap_SalesRevenueGoodsNet | $ 7,348,754 us-gaap_SalesRevenueGoodsNet | $ 5,787,980 us-gaap_SalesRevenueGoodsNet
Intersegment sales |  |  |  |  |  |  |  |  | (116,348)us-gaap_Revenues | (106,660)us-gaap_Revenues | (90,807)us-gaap_Revenues
Operating income (loss) |  |  |  |  |  |  |  |  | 772,796 us-gaap_OperatingIncomeLoss | 546,931 us-gaap_OperatingIncomeLoss | 379,508 us-gaap_OperatingIncomeLoss
Depreciation and amortization |  |  |  |  |  |  |  |  | 345,570 us-gaap_DepreciationDepletionAndAmortization | 308,871 us-gaap_DepreciationDepletionAndAmortization | 280,293 us-gaap_DepreciationDepletionAndAmortization
Capital expenditures (excluding acquisitions) |  |  |  |  |  |  |  |  | 561,804 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 366,550 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 208,294 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Assets | 8,285,544 us-gaap_Assets |  |  |  | 8,494,177 us-gaap_Assets |  |  |  | 8,285,544 us-gaap_Assets | 8,494,177 us-gaap_Assets | 6,303,684 us-gaap_Assets
Long-lived assets | 4,307,562 us-gaap_AssetsNoncurrent |  |  |  | 4,437,835 us-gaap_AssetsNoncurrent |  |  |  | 4,307,562 us-gaap_AssetsNoncurrent | 4,437,835 us-gaap_AssetsNoncurrent | 3,078,623 us-gaap_AssetsNoncurrent
Number of reporting segments |  |  |  |  |  |  |  |  | 3 mhk_SegmentReportingInformationNumberOfReportingSegments |  |
Carpet Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,013,948 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember | 2,986,096 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember | 2,912,055 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember
Operating income (loss) |  |  |  |  |  |  |  |  | 255,938 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember | 209,023 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember | 158,196 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember
Depreciation and amortization |  |  |  |  |  |  |  |  | 99,407 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember | 94,314 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember | 95,648 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember
Capital expenditures (excluding acquisitions) |  |  |  |  |  |  |  |  | 228,590 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember | 158,690 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember | 97,972 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember
Assets | 1,986,081 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember |  |  |  | 1,786,085 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember |  |  |  | 1,986,081 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember | 1,786,085 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember | 1,721,214 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CarpetSegmentMember
Ceramic Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,015,279 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember | 2,677,058 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember | 1,616,383 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember
Operating income (loss) |  |  |  |  |  |  |  |  | 351,113 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember | 209,825 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember | 120,951 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember
Depreciation and amortization |  |  |  |  |  |  |  |  | 120,121 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember | 97,126 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember | 41,176 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember
Capital expenditures (excluding acquisitions) |  |  |  |  |  |  |  |  | 192,642 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember | 110,750 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember | 49,426 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember
Assets | 3,542,594 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember |  |  |  | 3,787,785 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember |  |  |  | 3,542,594 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember | 3,787,785 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember | 1,731,258 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CeramicSegmentMember
Laminate and Wood Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,890,567 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember | 1,792,260 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember | 1,350,349 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember
Operating income (loss) |  |  |  |  |  |  |  |  | 194,734 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember | 159,365 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember | 126,409 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember
Depreciation and amortization |  |  |  |  |  |  |  |  | 115,360 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember | 105,907 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember | 132,183 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember
Capital expenditures (excluding acquisitions) |  |  |  |  |  |  |  |  | 131,296 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember | 88,293 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember | 56,605 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember
Assets | 2,542,566 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember |  |  |  | 2,716,759 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember |  |  |  | 2,542,566 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember | 2,716,759 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember | 2,672,389 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_LaminateandWoodSegmentMember
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 10,682 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 11,524 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 11,286 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Capital expenditures (excluding acquisitions) |  |  |  |  |  |  |  |  | 9,276 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 8,817 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 4,291 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Corporate and Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (28,989)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_CorporateAndIntersegmentEliminationsMember | (31,282)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_CorporateAndIntersegmentEliminationsMember | (26,048)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mhk_CorporateAndIntersegmentEliminationsMember
Assets | 214,303 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CorporateAndIntersegmentEliminationsMember |  |  |  | 203,548 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CorporateAndIntersegmentEliminationsMember |  |  |  | 214,303 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CorporateAndIntersegmentEliminationsMember | 203,548 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CorporateAndIntersegmentEliminationsMember | 178,823 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mhk_CorporateAndIntersegmentEliminationsMember
North America [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 5,547,867 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 5,512,182 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 4,798,804 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
Long-lived assets | 2,513,977 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember |  |  |  | 2,332,296 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember |  |  |  | 2,513,977 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 2,332,296 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 1,968,561 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
Rest Of World [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,255,579 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = mhk_RestOfWorldMember | 1,836,572 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = mhk_RestOfWorldMember | 989,176 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = mhk_RestOfWorldMember
Long-lived assets | 1,793,585 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = mhk_RestOfWorldMember |  |  |  | 2,105,539 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = mhk_RestOfWorldMember |  |  |  | 1,793,585 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = mhk_RestOfWorldMember | 2,105,539 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = mhk_RestOfWorldMember | 1,110,062 us-gaap_AssetsNoncurrent / us-gaap_StatementGeographicalAxis = mhk_RestOfWorldMember
Soft Surface [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,764,370 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = mhk_SoftSurfaceMember | 2,756,627 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = mhk_SoftSurfaceMember | 2,696,462 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = mhk_SoftSurfaceMember
Tile [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,087,895 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = mhk_TileMember | 2,744,289 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = mhk_TileMember | 1,676,971 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = mhk_TileMember
Wood [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 1,951,181 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = mhk_WoodMember | $ 1,847,838 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = mhk_WoodMember | $ 1,414,547 us-gaap_SalesRevenueGoodsNet / us-gaap_ProductOrServiceAxis = mhk_WoodMember

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