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Commitments and Contingencies - Narrative (Details) $ in Millions	Apr. 30, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Exposure to earthquake loss	$ 83.8

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- Definition

Catastrophe Claims, Maximum Exposure, Carrying Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	mcy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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