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Subsequent Events (Details) (New Unsecured Credit Facility [Member] [Member], USD $) In Millions, unless otherwise specified | Jul. 18, 2013
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Subsequent Event [Line Items] |
Line of Credit Facility, Current Borrowing Capacity | $ 200
MIH Unsecured Line of Credit Facility, Maximum Borrowing Capacity | 225
Sub-limit for letters of credit | 100
Optional increase in borrowing availability | $ 25.0
Minimum [Member] |
Subsequent Event [Line Items] |
Credit Facility, Basis Spread on Variable Rate | 2.25%
Maximum [Member] |
Subsequent Event [Line Items] |
Credit Facility, Basis Spread on Variable Rate | 3.25%

X
- Definition Percentage points added to the reference rate to compute the variable rate on the credit facility borrowings. + References No definition available. + Details
Name: | mho_CreditFacilityBasisSpreadonVariableRate
Namespace Prefix: | mho_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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

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
Name: | us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix: | us-gaap_
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
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration