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Debt Debt (Details) (USD $) | Sep. 30, 2012
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Line of Credit Facility [Line Items] |
Debt Instrument, Unused Borrowing Capacity, Amount | $ 72,611,000
Line of Credit Facility, Amount Outstanding | 0
letters of credit outstanding under credit facility | 17,831,000
Line of Credit Facility, Remaining Borrowing Capacity | 54,780,000
Inventory Pledged as Collateral Under Line of Credit Facility | 187,083,000
Letters of Credit Outstanding Under Letter of Credit Facilities | 8,156,000
Number of Secured Letters of Credit Outstanding under Credit Facility | 3
Restricted Cash for Secured Letter of Credit Agreements | 8,341,000
Low Range Uncommitted Letter of Credit [Member] |
Line of Credit Facility [Line Items] |
Maximum Available Amounts under Letter of Credit Facilities | 5,000,000
High Range Uncommittted Letter of Credit [Member] |
Line of Credit Facility [Line Items] |
Maximum Available Amounts under Letter of Credit Facilities | 8,000,000
Uncommitted Letter of Credit [Member] |
Line of Credit Facility [Line Items] |
Maximum Available Amounts under Letter of Credit Facilities | $ 5,000,000

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- Definition Book Value of Inventory Pledged as Collateral Under the Company's Credit Facility + References No definition available. + Details
Name: | mho_InventoryPledgedAsCollateralUnderLineOfCreditFacility
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition The amount of letters of credit outstanding under the Company's Credit Facility + References No definition available. + Details
Name: | mho_LettersOfCreditOutstandingUnderCreditFacility
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Letters of Credit Outstanding Under the Company's Letter of Credit Facilities + References No definition available. + Details
Name: | mho_LettersOfCreditOutstandingUnderLetterOfCreditFacilities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum Available Amounts under Letter of Credit Facilities + References No definition available. + Details
Name: | mho_MaximumAvailableAmountsUnderLetterOfCreditFacilities
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The number of secured letters of credit outstanding under the Company's Credit Facility. + References No definition available. + Details
Name: | mho_NumberOfSecuredLettersOfCreditOutstandingUnderCreditFacility
Namespace Prefix: | mho_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents restricted cash deposits maintained as collateral for outstanding letter of credit arrangements. + References No definition available. + Details
Name: | mho_RestrictedCashForSecuredLetterOfCreditAgreements
Namespace Prefix: | mho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 2: 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_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant