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Pension and Other Postretirement Plans - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 18, 2025	Dec. 29, 2024	Sep. 28, 2025	Dec. 29, 2024
Retirement Benefits [Abstract]
Payment for settlement	$ 5.2			$ 41.9
Defined benefit plan settlements plan assets, percentage				34.00%
Net periodic benefit cost (credit), gain (loss) due to settlement		$ 2.9	$ 0.2

X

- Definition

Defined Benefit Plan Settlements Plan Assets, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	mbc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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- References

No definition available.

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)(7)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(7)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-6

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X

- Definition

Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(8)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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