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v3.25.2

Segment Reporting - Narrative (Details) - International | Jun. 30, 2025 country language
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Segment Reporting Information [Line Items] |
Number of countries where the company provides digital and print solutions (more than) | country | 100
Number of languages where the company provides digital and print solutions (more than) | language | 80

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- Definition Number Of Countries In Which Entity Provides Products + References No definition available. + Details
Name: | mh_NumberOfCountriesInWhichEntityProvidesProducts
Namespace Prefix: | mh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number Of Languages In Which The Entity Provides Products + References No definition available. + Details
Name: | mh_NumberOfLanguagesInWhichTheEntityProvidesProducts
Namespace Prefix: | mh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mh_InternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |