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v3.25.3

Benefit Plans - Narrative (Details) $ in Millions | 9 Months Ended
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Sep. 27, 2025 USD ($)
Retirement Benefits [Abstract] |
Multiemployer plans, withdrawal obligation recognized | $ 4.8

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- Definition Multiemployer Plans, Withdrawal Obligation Recognized + References No definition available. + Details
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Namespace Prefix: | mli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration