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Inventory and Capitalized Interest Other Inventory Items - Homes under construction not subject to a sale contract (Details) $ in Thousands | Sep. 30, 2020 USD ($) homes | Dec. 31, 2019 USD ($)
--- | --- | ---
Other Inventory, Gross [Abstract] |  |
Number of Speculative Homes | 1,113 | 1,459
Speculative Homes Carrying Value | $ 188,400 | $ 304,000
Community Development District | $ 9,892 | $ 13,531

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- Definition A CDD is a unit of local government created to allow for the construction and maintenance of long-term infrastructure through alternative financing sources. CDDs may utilize bond financing to fund construction or acquisition of certain on-site and off-site infrastructure improvements near or within a community. + References No definition available. + Details
Name: | mho_CommunityDevelopmentDistrict
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The number of speculative units (homes not subject to a sales contract) included in homes under construction. + References No definition available. + Details
Name: | mho_NumberOfSpeculativeHomes
Namespace Prefix: | mho_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The carrying value of the speculative homes included in homes under construction. + References No definition available. + Details
Name: | mho_SpeculativeHomesCarryingValue
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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