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Debt Senior Notes (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 24 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Nov. 14, 2016 | Nov. 14, 2015 | Nov. 15, 2018 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 228,569,000 us-gaap_SeniorNotes |  |  |  | $ 228,469,000 us-gaap_SeniorNotes
Convertible senior subordinated notes due 2018 | 86,250,000 mho_A2018ConvertibleSubordinatedDebt |  |  |  | 86,250,000 mho_A2018ConvertibleSubordinatedDebt
Convertible senior subordinated notes due 2017 | 57,500,000 mho_A2017ConvertibleSubordiantedDebt |  |  |  | 57,500,000 mho_A2017ConvertibleSubordiantedDebt
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 102.156%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed | 104.313%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed | 100.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed |
Preferred Stock, Dividend Rate, Percentage | 9.75%us-gaap_PreferredStockDividendRatePercentage |  |  |  |
Restricted Payments Basket | 150,500,000 mho_RestrictedPaymentsBasket |  |  |  | 148,600,000 mho_RestrictedPaymentsBasket
2018 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mho_A2018SeniorNotesMember |  |  |  |
2017 Convertible Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember |  |  |  |
Debt Instrument, Convertible, Conversion Ratio | 42.0159 us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember |  |  |  |
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation | 1,000 mho_DebtInstrumentConvertiblePrincipalAmountUsedInConversionRateCalculation / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ 23.80 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember |  |  |  |
Stock Issued During Period, Shares, Other | 2.4 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_DebtInstrumentAxis = mho_A2017ConvertibleSeniorNotesMember |  |  |  |
2018 Convertible Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember |  |  |  |
Debt Instrument, Convertible, Conversion Ratio | 30.9478 us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember |  |  |  |
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation | 1,000 mho_DebtInstrumentConvertiblePrincipalAmountUsedInConversionRateCalculation / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ 32.31 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember |  |  |  |
Stock Issued During Period, Shares, Other | 2.7 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_DebtInstrumentAxis = mho_A2018ConvertibleSeniorNotesMember |  |  |  |
Face Value [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | 230,000,000 us-gaap_SeniorNotes / us-gaap_FairValueByMeasurementBasisAxis = mho_FacevalueMember |  |  |  |
Base of restricted payments basket income calculation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Other Restrictions on Payment of Dividends | $ 40,000,000 mho_Restrictionsonpaymentofdividends / mho_RestrictedPaymentsBasketCalculationAxis = mho_BaseofrestrictedpaymentsbasketincomecalculationMember |  |  |  |
Percentage of our aggregate consolidated net income added to base amount of calculation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent restrictions on payment of dividends | 50.00%mho_Percentrestrictionsonpaymentofdividends / mho_RestrictedPaymentsBasketCalculationAxis = mho_PercentageofouraggregateconsolidatednetincomeaddedtobaseamountofcalculationMember |  |  |  |
Percentage of our aggregate consolidated net income subtracted from base amount of calculation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent restrictions on payment of dividends | 100.00%mho_Percentrestrictionsonpaymentofdividends / mho_RestrictedPaymentsBasketCalculationAxis = mho_PercentageofouraggregateconsolidatednetincomesubtractedfrombaseamountofcalculationMember |  |  |  |
Percentage of net cash proceeds from sale of qualified equity interests added to base and income/loss amount in calculation [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent restrictions on payment of dividends | 100.00%mho_Percentrestrictionsonpaymentofdividends / mho_RestrictedPaymentsBasketCalculationAxis = mho_PercentageofnetcashproceedsfromsaleofqualifiedequityinterestsaddedtobaseandincomelossamountincalculationMember |  |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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