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v3.25.3

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)

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- 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