Fair value of assets impaired.

No definition available.

Name:	mcs_ImpairedAssetFairValue
Namespace Prefix:	mcs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Impairment Charge [Line Items]

+ References

No definition available.

+ Details

Name:	mcs_ImpairmentChargeLineItems
Namespace Prefix:	mcs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of discount rate used as an assumption to estimate the fair value of intangible asset.

+ References

No definition available.

+ Details

Name:	mcs_IntangibleAssetsFairValueAssumptionDiscountRate
Namespace Prefix:	mcs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of royalty rate used as an assumption to estimate the fair value of intangible asset.

+ References

No definition available.

+ Details

Name:	mcs_IntangibleAssetsFairValueAssumptionRoyaltyRate
Namespace Prefix:	mcs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

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

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

+ Details

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

- Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Impairment Charges - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 01, 2021	Mar. 26, 2020	Jun. 25, 2020
Impairment Charge [Line Items]
Impaired Asset Fair Value		$ 13,686,000
Trade names
Impairment Charge [Line Items]
Impaired Asset Fair Value			$ 7,300,000
Royalty rate (as a percent)		1.00%
Discount rate (as a percent)		17.00%
Impairment charge			$ 2,200,000
Fair Value, Inputs, Level 3 [Member]
Impairment Charge [Line Items]
Impairment of Fixed Assets	$ 3,732,000	$ 6,512,000
Impaired Asset Fair Value	$ 10,200,000
Fair Value, Inputs, Level 3 [Member] \| Trade names
Impairment Charge [Line Items]
Impairment charge		$ 2,200,000