Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 26, 2024	Sep. 28, 2023	Sep. 26, 2024	Sep. 28, 2023
Statement of Comprehensive Income [Abstract]
Amortization of the net actuarial loss and prior service credit related to the pension, net of tax effect (benefit)	$ (4)	$ (4)	$ (13)	$ (13)
Fair market value adjustment of interest rate swap, net of tax effect (benefit)				(8)
Reclassification adjustment on interest rate swap included in interest expense, net of tax effect (benefit)				$ (20)

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

No definition available.

+ Details

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

- Definition

Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-12

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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