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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 26, 2024	Sep. 30, 2025	Sep. 26, 2024
Statement of Comprehensive Income [Abstract]
Amortization of the net actuarial loss and prior service credit related to the pension, net of tax effect (benefit)	$ (1)	$ (4)	$ (4)	$ (13)

X

- Definition

Other Comprehensive (Income) Loss, Defined Benefit Plan, Amortization Of Net Actuarial Loss And Prior Service Credit Related To Pension, Tax Expense (Benefit)

+ References

No definition available.

+ Details

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Namespace Prefix:	mcs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration