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Income Taxes Net Operating Loss Carryforwards (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015
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State and Local Jurisdiction [Member] |
Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforwards | $ 11.4 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Expiring between 2015 and 2027 [Member] | State and Local Jurisdiction [Member] |
Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforwards | 6.4 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / mho_NetOperatingLossCarryforwardExpirationDatesAxis = mho_Between2028and2032Member
Expiring beginning in 2028 [Member] | Internal Revenue Service (IRS) [Member] |
Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforwards | 45.7 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / mho_NetOperatingLossCarryforwardExpirationDatesAxis = mho_A2028Member
Federal Tax Credit Carryforward, Amount | 7.2 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / mho_NetOperatingLossCarryforwardExpirationDatesAxis = mho_A2028Member
Expiring between 2028 and 2033 [Member] | State and Local Jurisdiction [Member] |
Operating Loss Carryforwards [Line Items] |
Operating Loss Carryforwards | $ 5.0 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / mho_NetOperatingLossCarryforwardExpirationDatesAxis = mho_Betweencurrentyearand2027Member

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Details
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