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Goodwill and intangible assets (Schedule of intangible assets subject to amortization) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Apr. 04, 2015 | Mar. 29, 2014 | Dec. 31, 2014
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | $ 626,713us-gaap_FiniteLivedIntangibleAssetsGross |  |
Currency translation during the period | (46,523)us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments |  |
Intangible assets subject to amortization, ending balance | 580,190us-gaap_FiniteLivedIntangibleAssetsGross |  |
Accumulated amortization, beginning balance | 547,395us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  |
Amortization during the period | 5,106us-gaap_AmortizationOfIntangibleAssets | 6,038us-gaap_AmortizationOfIntangibleAssets |
Currency translation during the period | (42,119)mhk_FiniteLivedIntangibleAssetsAccumulatedAmortizationTranslationAdjustments |  |
Accumulated amortization, ending balance | 510,382us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  |
Intangible assets subject to amortization, net | 69,808us-gaap_FiniteLivedIntangibleAssetsNet |  | 79,318us-gaap_FiniteLivedIntangibleAssetsNet
Customer Relationships [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 354,768us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Currency translation during the period | (20,157)us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Intangible assets subject to amortization, ending balance | 334,611us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Accumulated amortization, beginning balance | 320,851us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Amortization during the period | 1,671us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Currency translation during the period | (20,014)mhk_FiniteLivedIntangibleAssetsAccumulatedAmortizationTranslationAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Accumulated amortization, ending balance | 302,508us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Intangible assets subject to amortization, net | 32,103us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Patents [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 270,466us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |  |
Currency translation during the period | (26,351)us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |  |
Intangible assets subject to amortization, ending balance | 244,115us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |  |
Accumulated amortization, beginning balance | 225,875us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |  |
Amortization during the period | 3,405us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |  |
Currency translation during the period | (22,095)mhk_FiniteLivedIntangibleAssetsAccumulatedAmortizationTranslationAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |  |
Accumulated amortization, ending balance | 207,185us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |  |
Intangible assets subject to amortization, net | 36,930us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |  |
Other [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 1,479us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |  |
Currency translation during the period | (15)us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |  |
Intangible assets subject to amortization, ending balance | 1,464us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |  |
Accumulated amortization, beginning balance | 669us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |  |
Amortization during the period | 30us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |  |
Currency translation during the period | (10)mhk_FiniteLivedIntangibleAssetsAccumulatedAmortizationTranslationAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |  |
Accumulated amortization, ending balance | 689us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |  |
Intangible assets subject to amortization, net | $ 775us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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