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Inventories - Narrative (Details) - USD ($) $ in Millions | Dec. 28, 2024 | Dec. 30, 2023
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Inventory Disclosure [Abstract] |  |
LIFO inventory amount | $ 12.4 | $ 20.2
FIFO cost of inventories | 128.0 | 122.9
FIFO value of inventory consigned to others | $ 17.1 | $ 19.8

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- Definition Carrying amount as of the balance sheet date of FIFO value inventory owned by the entity but in the hands of a customer, typically a reseller. + References No definition available. + Details
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Namespace Prefix: | mli_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483489/210-10-50-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
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- Definition The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483489/210-10-50-1 + Details
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