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Leases (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Lessee, Lease, Description [Line Items] |  |  |
Amount of leases not yet commenced | $ 13,932 |  |
Rent expense under operating leases | $ 127,990 |  |
Rent expense under operating leases |  | $ 143,513 | $ 145,176
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Term of lease contracts (in years) | 1 year |  |
Term of lease contracts, majority (in years) | 1 year |  |
Lease extensions (in years) | 3 years |  |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Term of lease contracts (in years) | 60 years |  |
Term of lease contracts, majority (in years) | 8 years |  |
Lease extensions (in years) | 10 years |  |

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- Definition Lessee, Lease, Renewal Term + References No definition available. + Details
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Namespace Prefix: | mhk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Not Yet Commenced, Amount + References No definition available. + Details
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Namespace Prefix: | mhk_
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- Definition Lessee, Term Of Contract + References No definition available. + Details
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- Definition Lessee, Term Of Contract, Majority + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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- Details
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- Details
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