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v3.20.4

Subsequent Event (Details) - USD ($) $ in Millions | Jan. 29, 2021 | Dec. 26, 2020
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Subordinated Debt [Member] |  |
Subsequent Event [Line Items] |  |
Debt, stated interest rate (as a percent) |  | 6.00%
Subsequent Event [Member] | Asset Purchase Agreement with Hart & Cooley LLC [Member] |  |
Subsequent Event [Line Items] |  |
Asset acquisition, cash paid | $ 14.0 |

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- Definition Asset Acquisition, Consideration Transferred + References No definition available. + Details
Name: | mli_AssetAcquisitionConsiderationTransferred
Namespace Prefix: | mli_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | mli_AssetAcquisitionAxis=mli_AssetPurchaseAgreementWithHartCooleyLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |