XML 47 R34.htm IDEA: XBRL DOCUMENT
v3.25.1

Segment Information - Schedule of Disaggregation of Revenue From Contracts with Customers (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 29, 2025 | Mar. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | $ 1,000,165 | $ 849,654
Piping Systems |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 629,359 | 579,865
Industrial Metals |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 247,790 | 153,151
Climate |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 123,016 | 116,638
Operating Segments |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 1,014,703 | 863,045
Operating Segments | Piping Systems |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 639,683 | 590,168
Operating Segments | Industrial Metals |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 251,913 | 156,067
Operating Segments | Climate |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 123,107 | 116,810
Operating Segments | Tube and fittings |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 525,796 | 478,476
Operating Segments | Tube and fittings | Piping Systems |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 525,796 | 478,476
Operating Segments | Tube and fittings | Industrial Metals |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments | Tube and fittings | Climate |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments | Brass rod, forgings, wire and cable |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 219,281 | 124,059
Operating Segments | Brass rod, forgings, wire and cable | Piping Systems |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments | Brass rod, forgings, wire and cable | Industrial Metals |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 219,281 | 124,059
Operating Segments | Brass rod, forgings, wire and cable | Climate |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments | OEM components, tube and assemblies |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 49,475 | 48,974
Operating Segments | OEM components, tube and assemblies | Piping Systems |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments | OEM components, tube and assemblies | Industrial Metals |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 18,215 | 18,957
Operating Segments | OEM components, tube and assemblies | Climate |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 31,260 | 30,017
Operating Segments | Valves and plumbing specialties |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 113,887 | 111,692
Operating Segments | Valves and plumbing specialties | Piping Systems |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 113,887 | 111,692
Operating Segments | Valves and plumbing specialties | Industrial Metals |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments | Valves and plumbing specialties | Climate |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments | Flex duct and other HVAC components |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 91,847 | 86,793
Operating Segments | Flex duct and other HVAC components | Piping Systems |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments | Flex duct and other HVAC components | Industrial Metals |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments | Flex duct and other HVAC components | Climate |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 91,847 | 86,793
Operating Segments | Other |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 14,417 | 13,051
Operating Segments | Other | Piping Systems |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Operating Segments | Other | Industrial Metals |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 14,417 | 13,051
Operating Segments | Other | Climate |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | 0 | 0
Intersegment sales |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | (14,538) | (13,391)
Intersegment sales | Piping Systems |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | (10,324) | (10,303)
Intersegment sales | Industrial Metals |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | (4,123) | (2,916)
Intersegment sales | Climate |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net sales | $ (91) | $ (172)

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-4 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mli_PipingSystemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mli_IndustrialMetalsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mli_ClimateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mli_TubeAndFittingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mli_BrassRodAndForgingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mli_OEMComponentsTubeAndAssembliesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mli_ValvesAndPlumbingSpecialtiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mli_FlexDuctAndOtherHVACComponentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mli_OtherProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |