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Income Taxes (Details)	3 Months Ended		9 Months Ended
	Sep. 26, 2019	Sep. 27, 2018	Sep. 26, 2019	Sep. 27, 2018
Income Taxes
Effective Income Tax Rate	25.30%	13.90%	23.40%	21.50%

X

- Definition

The effective income tax rate of the company during the period.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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