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Insurance Claim (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 30, 2024 | Apr. 01, 2023 | Mar. 29, 2025
Insurance [Abstract] |  |  |
Insurance advances |  |  | $ 35.0
Proceeds from insurance settlement received | $ 25.0 | $ 10.0 |
Insurance advances, net |  |  | $ 21.1

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- Definition Insurance Advances, Net + References No definition available. + Details
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Namespace Prefix: | mli_
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition Amount of cash inflow for proceeds from settlement of insurance claim, classified as operating activities. Excludes insurance settlement classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 45 -Paragraph 16 -Subparagraph (c) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 21B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-21B + Details
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