Represents the information pertaining to number of note purchase agreements.

No definition available.

Name:	mcs_NumberOfPurchaseAgreements
Namespace Prefix:	mcs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

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

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Period Type:	duration

- Definition

Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=mcs_NotePurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mcs_SixPointEightNinePercentSeries2024SeniorNotesTrancheAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mcs_SevenPintZeroTwoPercentSeries2024SeniorNotesTrancheBMember
Namespace Prefix:
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Balance Type:
Period Type:

Long-Term Debt - Senior Notes (Details)		12 Months Ended
Long-Term Debt - Senior Notes (Details)	Jul. 09, 2024 USD ($)	Dec. 26, 2024 USD ($) agreement	Dec. 28, 2023 USD ($)
Debt Instrument [Line Items]
Senior notes, noncurrent		$ 160,000,000	$ 70,000,000
Note Purchase Agreement
Debt Instrument [Line Items]
Senior notes, noncurrent		$ 160,000,000
Number of agreements \| agreement		2
Note Purchase Agreement \| Minimum
Debt Instrument [Line Items]
Interest rate		4.02%
Note Purchase Agreement \| Maximum
Debt Instrument [Line Items]
Interest rate		7.02%
Senior Notes
Debt Instrument [Line Items]
Number of agreements \| agreement		1
Weighted average interest rate		5.94%	4.23%
Face amount	$ 100,000,000
Proceeds from issuance of debt	$ 100,000,000
Senior Notes \| Six Point Eight Nine Percent Series 2024 Senior Notes, Tranche A
Debt Instrument [Line Items]
Interest rate	6.89%
Face amount	$ 60,000,000
Proceeds from issuance of debt	$ 60,000,000
Senior Notes \| Seven Pint Zero Two Percent Series 2024 Senior Notes, Tranche B
Debt Instrument [Line Items]
Interest rate	7.02%
Face amount	$ 40,000,000
Proceeds from issuance of debt	$ 40,000,000