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Subsequent Events (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 Rate
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Subsequent Event [Line Items] |
Percentage of cumulative consolidated net income after June 30, 2014 plus $353.9 million | 50.00%
Percentage of net proceeds of any equity offerings after June 30, 2014 plus $353.9 million minimum tangible net worth | 50.00%
First Amendment to New Unsecured Credit Facility [Member] |
Subsequent Event [Line Items] |
Minimum Tangible Net Worth | $ 353.9
Line of Credit Facility, Current Borrowing Capacity | 300
Line of Credit Facility, Maximum Borrowing Capacity | 400
Sub-limit for letters of credit | 125
First Amendment to New Unsecured Credit Facility [Member] | Maximum [Member] |
Subsequent Event [Line Items] |
Credit Facility, Basis Spread on Variable Rate | 2.50%
First Amendment to New Unsecured Credit Facility [Member] | Minimum [Member] |
Subsequent Event [Line Items] |
Credit Facility, Basis Spread on Variable Rate | 1.50%
New Unsecured Credit Facility [Member] |
Subsequent Event [Line Items] |
Line of Credit Facility, Current Borrowing Capacity | 200
Line of Credit Facility, Maximum Borrowing Capacity | 225
Sub-limit for letters of credit | $ 100
New Unsecured Credit Facility [Member] | Maximum [Member] |
Subsequent Event [Line Items] |
Credit Facility, Basis Spread on Variable Rate | 3.25%
New Unsecured Credit Facility [Member] | Minimum [Member] |
Subsequent Event [Line Items] |
Credit Facility, Basis Spread on Variable Rate | 2.25%

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- Definition Percentage points added to the reference rate to compute the variable rate on the credit facility borrowings. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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
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Data Type: | xbrli:monetaryItemType
Balance Type: | na
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X
- Definition Percentage of cumulative consolidated net income earned after June 30, 2014 plus $353.9 million as part of the minimum tangible net worth calculation + References No definition available. + Details
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Namespace Prefix: | mho_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of net proceeds of any equity offerings on or after June 30, 2014 plus $353.9 million minimum tangible net worth + References No definition available. + Details
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X
- Definition Sub-limit for letters of credit + References No definition available. + Details
Name: | mho_Sublimitforlettersofcredit
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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