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Insurance Claim (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended		31 Months Ended
	Sep. 27, 2025	Jun. 28, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025
Insurance [Abstract]
Proceeds from insurance settlement received				$ 20,000		$ 55,000
Insured event, gain (loss), pretax	$ 4,900	$ 36,300
Insured event, gain (loss) after tax, diluted impact (in dollars per share)	$ 0.03	$ 0.25
Gain on sale of business	$ 11,852		$ 2,667	$ 26,654	$ 3,953

X

- Definition

Insured Event, Gain (Loss) after Tax, Impact per Diluted Share

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Insured Event, Gain (Loss), Pretax

+ References

No definition available.

+ Details

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Namespace Prefix:	mli_
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X

- Definition

Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-1B

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X

- References

No definition available.

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X

- 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

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