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Commitments and contingencies (Narrative) (Details) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended
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Mar. 21, 2011 claim | Nov. 30, 2014 BELGIUM Foreign Tax Authority [Member] Y | Sep. 29, 2012 BELGIUM Foreign Tax Authority [Member] EUR (€) | Jan. 31, 2012 BELGIUM Foreign Tax Authority [Member] 2008 [Member] EUR (€) | Jun. 28, 2014 BELGIUM Foreign Tax Authority [Member] 2008 [Member] EUR (€) | Dec. 28, 2012 BELGIUM Foreign Tax Authority [Member] 2005 [Member] EUR (€) | Dec. 28, 2012 BELGIUM Foreign Tax Authority [Member] 2009 [Member] EUR (€) | Dec. 31, 2013 BELGIUM Foreign Tax Authority [Member] 2006 [Member] EUR (€) | Dec. 31, 2013 BELGIUM Foreign Tax Authority [Member] 2007 [Member] EUR (€) | Dec. 31, 2013 BELGIUM Foreign Tax Authority [Member] 2010 [Member] EUR (€) | Apr. 04, 2015 Selling, General and Administrative Expenses [Member] USD ($) | Apr. 04, 2015 Polyurethane Foam Antitrust Litigation [Member] Pending Litigation [Member] USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of class action complaints | 2us-gaap_LossContingencyNewClaimsFiledNumber |  |  |  |  |  |  |  |  |  |  |
Damages claimed |  |  |  |  |  |  |  |  |  |  |  | $ 867,400us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LitigationCaseAxis = mhk_PolyurethaneFoamAntitrustLitigationMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember
Amount of legal settlement paid and related expenses |  |  |  |  |  |  |  |  |  |  | 125,000mhk_LitigationSettlementandRelatedExpenses / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |
Assessment received from Belgian tax authority (in euros) |  |  |  | 23,789mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2008Member | 30,131mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2008Member | 46,135mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / us-gaap_TaxPeriodAxis = mhk_TaxYear2005Member | 35,567mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2009Member | 38,817mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2006Member | 39,635mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2007Member | 43,117mhk_ForeignTaxAssessment / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE / us-gaap_TaxPeriodAxis = us-gaap_TaxYear2010Member |  |
Interest income earned on deposits related to tax assessment |  |  | € 1,583mhk_InterestTaxExaminationRefundInterestIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE |  |  |  |  |  |  |  |  |
Number of years of assessments appealed |  | 4mhk_TaxAssessmentsNumberOfYearsOfAssessmentsAppealed / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_BE |  |  |  |  |  |  |  |  |  |

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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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