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Inventory and Capitalized Interest Other Inventory Items - Homes under construction not subject to a sale contract (Details) $ in Millions | Dec. 31, 2019 USD ($) homes | Dec. 31, 2018 USD ($) homes
--- | --- | ---
Other Inventory, Gross [Abstract] |  |
Number of Speculative Homes | homes | 1,459 | 1,443
Speculative Homes Carrying Value | $ | $ 304.0 | $ 311.0

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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