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Inventories, Additional Information (Details) - USD ($) $ in Millions | Dec. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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Inventory Disclosure [Abstract] |  |  |
LIFO inventory amount | $ 26.5 |  | $ 14.4
FIFO cost of inventories | 111.0 |  | 76.6
Average cost basis inventories | 43.9 |  | 43.8
Liquidation of LIFO inventory layers deferred |  |  | 2.5
Liquidation of LIFO inventory layers |  |  | 3.3
Excess inventory |  | $ 38.9 |
FIFO value of inventory consigned to others | $ 4.4 |  | $ 2.5

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- Definition Excess Inventory + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
Balance Type: | debit
Period Type: | instant

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- Definition Refers to the liquidation of LIFO inventory layers. + 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 This element refers to liquidation of LIFO inventory layers deferred. + References No definition available. + Details
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Namespace Prefix: | mli_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + 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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- 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition The amount of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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