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Leases - Additional Information (Details) | Jun. 25, 2020 USD ($)
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Deferred rent payments under operating lease | $ 5,647,000
Deferred rent payments under finance lease included in other accrued liabilities | 725,000
Long-term operating lease obligations |
Deferred rent payments under operating lease | $ 1,110,000
Minimum [Member] |
Lessee, Operating Lease, Term of Contract | 1 year
Maximum [Member] |
Lessee, Operating Lease, Term of Contract | 45 years

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- Definition Amount of deferred rent payments under the finance leases. + References No definition available. + Details
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Namespace Prefix: | mcs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of deferred rent payments under the operating leases. + References No definition available. + Details
Name: | mcs_OperatingLeaseDeferredRentPayments
Namespace Prefix: | mcs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementClassOfStockAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementClassOfStockAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |