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Subsequent Event Subsequent Event (Details) $ in Millions | Jun. 30, 2017 USD ($)
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Subsequent Event [Line Items] |
Optional increase in borrowing availability | $ 25.0
Maximum borrowing availability, subject to obtaining additional commitments | 500.0
Minimum Tangible Net Worth | 465.2
First Amendment to New Unsecured Credit Facility [Member] |
Subsequent Event [Line Items] |
Line of Credit Facility, Maximum Borrowing Capacity | 400.0
Second Amendment to Credit Facility [Member] |
Subsequent Event [Line Items] |
Line of Credit Facility, Maximum Borrowing Capacity | $ 475.0
Maximum [Member] | First Amendment to New Unsecured Credit Facility [Member] |
Subsequent Event [Line Items] |
Basis Points Spread on Variable Rate - Credit Facility | 250

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- Definition Basis points added to the reference rate to compute the variable rate on the credit facility borrowings. + References No definition available. + Details
Name: | mho_BasisPointsSpreadonVariableRateCreditFacility
Namespace Prefix: | mho_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum borrowing availability, subject to obtaining additional commitments + References No definition available. + Details
Name: | mho_Maximumborrowingavailabilitysubjecttoobtainingadditionalcommitments
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The lowest amount of tangible net worth required by secondary market investors. + References No definition available. + Details
Name: | mho_MinimumTangibleNetWorth
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Optional increase in borrowing availability + References No definition available. + Details
Name: | mho_Optionalincreaseinborrowingavailability
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=mho_FirstAmendmenttoNewUnsecuredCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=mho_SecondAmendmenttoCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |