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Fair Value Measurements Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
ASSETS: |  |
Cash, cash equivalents and restricted cash | $ 20,393 | $ 21,529
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 20,393 | 21,529
Mortgage loans held for sale | 123,909 | 169,651
Split dollar life insurance policies | 206 | 206
Commitments to extend real estate loans (assets) | 1,432 | 989
LIABILITIES: |  |
Notes payable - homebuilding operations - Fair Value Disclosure | 174,300 | 117,400
Notes Payable - Financial Services Fair Value Disclosure | 104,003 | 153,168
Notes payable - other | 5,092 | 5,938
Senior notes due 2021 (a) | 300,000 | 300,000
Senior notes due 2025 (a) | 250,000 | 250,000
Whole Loan contracts for committed IRLCs and mortgage loans held for sale | 116 | 154
Forward sales of mortgage-backed securities | 1,973 | 3,305
Off-Balance Sheet Letters of Credit | 0 | 0
Estimate of Fair Value, Fair Value Disclosure [Member] |  |
ASSETS: |  |
Cash, cash equivalents and restricted cash | 20,393 | 21,529
Mortgage loans held for sale | 123,909 | 169,651
Split dollar life insurance policies | 206 | 206
Commitments to extend real estate loans (assets) | 1,432 | 989
LIABILITIES: |  |
Notes payable - homebuilding operations - Fair Value Disclosure | 174,300 | 117,400
Notes Payable - Financial Services Fair Value Disclosure | 104,003 | 153,168
Notes payable - other | 4,440 | 5,112
Senior notes due 2021 (a) | 304,875 | 298,500
Senior notes due 2025 (a) | 253,750 | 228,750
Whole Loan contracts for committed IRLCs and mortgage loans held for sale | 116 | 154
Forward sales of mortgage-backed securities | 1,973 | 3,305
Off-Balance Sheet Letters of Credit | $ 1,457 | $ 944

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- Definition Value of best efforts contracts for committed interest rate lock commitments and mortgage loans held for sale as of the balance sheet date. + References No definition available. + Details
Name: | mho_BestEffortsContractsforCommittedInterestRateLockCommitmentsandMortgageLoansHeldforSaleFairValueDisclosuresLiabilities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Forward sales of mortgage-backed securities - fair value disclosures (liabilities) + References No definition available. + Details
Name: | mho_ForwardContractsFairValueDisclosuresLiabilities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Interest Rate Lock Commitments - Fair Value Disclosures (Assets) + References No definition available. + Details
Name: | mho_InterestRateLockCommitmentsFairValueDisclosuresAssets
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Mortgage Loans Held For Sale + References No definition available. + Details
Name: | mho_MortgageLoansHeldForSale
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notes Payable - Financial Services Fair Value Disclosure + References No definition available. + Details
Name: | mho_NotesPayableFinancialServicesFairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Notes Payable - Homebuilding + References No definition available. + Details
Name: | mho_NotesPayableHomebuildingFairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Off-Balance Sheet Letters of Credit + References No definition available. + Details
Name: | mho_OffBalanceSheetLettersofCredit
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Including the current and noncurrent portions, this element represents the loans payable which were initially due after one year or beyond the operating cycle, if longer, and which are not otherwise defined in the taxonomy. + References No definition available. + Details
Name: | mho_OtherLoansPayableFairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Senior Notes - Fair Value Disclosures + References No definition available. + Details
Name: | mho_SeniorNotesFairValueDisclosures
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Senior Notes due 2025 Fair Value Disclosure + References No definition available. + Details
Name: | mho_SeniorNotesdue2025FairValueDisclosure
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Split dollar life insurance policies - amount as of the balance sheet date which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References No definition available. + Details
Name: | mho_SplitDollarLifeInsurancePolicies
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total Cash, Cash Equivalents and Restricted Cash + References No definition available. + Details
Name: | mho_TotalCashCashEquivalentsAndRestrictedCash
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_AssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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

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- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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