Basis of Presentation	9 Months Ended
Sep. 30, 2013
Basis of Presentation [Abstract]
Basis of Accounting [Text Block]	Basis of Presentation The accompanying Unaudited Condensed Consolidated Financial Statements (the “financial statements”) of M/I Homes, Inc. and its subsidiaries (the “Company”) and notes thereto have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial information. The financial statements include the accounts of M/I Homes, Inc. and its subsidiaries. All intercompany transactions have been eliminated. Results for the interim period are not necessarily indicative of results for a full year. In the opinion of management, the accompanying financial statements reflect all adjustments (all of which are normal and recurring in nature) necessary for a fair presentation of financial results for the interim periods presented. These financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2012 (the “2012 Form 10-K”). The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during that period. Actual results could differ from these estimates and have a significant impact on the financial condition and results of operations and cash flows. With regard to the Company, estimates and assumptions are inherent in calculations relating to valuation of inventory and investment in unconsolidated joint ventures, property and equipment depreciation, valuation of derivative financial instruments, accounts payable on inventory, accruals for costs to complete inventory, accruals for warranty claims, accruals for self-insured general liability claims, litigation, accruals for health care and workers' compensation, accruals for guaranteed or indemnified loans, stock-based compensation expense, income taxes, and contingencies. Items that could have a significant impact on these estimates and assumptions include the risks and uncertainties listed in “Item 1A. Risk Factors” in Part I of our 2012 Form 10-K, as the same may be updated from time to time in our subsequent filings with the SEC. Reclassifications The Company reclassified certain amounts presented in the Supplemental Condensed Consolidating Balance Sheet for the period ended December 31, 2012 and the Supplemental Condensed Consolidating Statement of Cash Flows for the nine months ended September 30, 2012 included in Note 13. The Company believes these reclassifications are immaterial to the supplemental condensed consolidating financial statements which are presented as supplemental information. These reclassifications do not affect the Company's consolidated financial statements for either period. Impact of New Accounting Standards In January 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update (“ASU”) No. 2013-01: Balance Sheet (Topic 210) - Disclosures about Offsetting Assets and Liabilities (“ASU 2013-01”). ASU 2013-01 amended ASU 2011-11 and will enhance disclosures required by the United States Generally Accepted Accounting Principles (“U.S. GAAP”) by requiring additional information about financial and derivative instruments that are either (1) offset in accordance with Section 210-20-45 or Section 815-10-45 or (2) subject to an enforceable master netting arrangement or similar agreement, irrespective of whether they are offset in accordance with Section 210-20-45 or Section 815-10-45. We are required to apply the amendments for annual reporting periods beginning on or after January 1, 2013, and for interim periods within those annual periods. The Company adopted this standard on January 1, 2013, and the adoption did not have a material impact on its Unaudited Condensed Consolidated Financial Statements. In April 2013, the FASB issued ASU No. 2013-04: Liabilities (“ASU 2013-04”), which provides guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. ASU 2013-04 is effective for us beginning January 1, 2014. The Company does not anticipate the adoption of this guidance will have a material impact on its Unaudited Condensed Consolidated Financial Statements or disclosures. In July 2013, the FASB issued ASU No. 2013-11: Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). The amendments in ASU 2013-11 are intended to end inconsistent practices regarding the presentation of unrecognized tax benefits on the balance sheet. An entity will be required to present an unrecognized tax benefit as a reduction of a deferred tax asset for a net operating loss (“NOL”) or tax credit carryforward whenever the NOL or tax credit carryforward would be available to reduce the additional taxable income or tax due if the tax position is disallowed. An entity is required to apply the amendments prospectively for annual reporting periods beginning after December 15, 2013, and for interim periods within those annual periods. Early adoption and retrospective application are permitted. The Company does not anticipate the adoption of this guidance will have a material impact on its Unaudited Condensed Consolidated Financial Statements or disclosures.

Basis of Presentation

The accompanying Unaudited Condensed Consolidated Financial Statements (the “financial statements”) of M/I Homes, Inc. and its subsidiaries (the “Company”) and notes thereto have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial information. The financial statements include the accounts of M/I Homes, Inc. and its subsidiaries. All intercompany transactions have been eliminated. Results for the interim period are not necessarily indicative of results for a full year. In the opinion of management, the accompanying financial statements reflect all adjustments (all of which are normal and recurring in nature) necessary for a fair presentation of financial results for the interim periods presented. These financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2012 (the “2012 Form 10-K”).

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during that period. Actual results could differ from these estimates and have a significant impact on the financial condition and results of operations and cash flows. With regard to the Company, estimates and assumptions are inherent in calculations relating to valuation of inventory and investment in unconsolidated joint ventures, property and equipment depreciation, valuation of derivative financial instruments, accounts payable on inventory, accruals for costs to complete inventory, accruals for warranty claims, accruals for self-insured general liability claims, litigation, accruals for health care and workers' compensation, accruals for guaranteed or indemnified loans, stock-based compensation expense, income taxes, and contingencies. Items that could have a significant impact on these estimates and assumptions include the risks and uncertainties listed in “Item 1A. Risk Factors” in Part I of our 2012 Form 10-K, as the same may be updated from time to time in our subsequent filings with the SEC.

Reclassifications

The Company reclassified certain amounts presented in the Supplemental Condensed Consolidating Balance Sheet for the period ended December 31, 2012 and the Supplemental Condensed Consolidating Statement of Cash Flows for the nine months ended September 30, 2012 included in Note 13. The Company believes these reclassifications are immaterial to the supplemental condensed consolidating financial statements which are presented as supplemental information. These reclassifications do not affect the Company's consolidated financial statements for either period.

Impact of New Accounting Standards

In January 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update (“ASU”) No. 2013-01: Balance Sheet (Topic 210) - Disclosures about Offsetting Assets and Liabilities (“ASU 2013-01”). ASU 2013-01 amended ASU 2011-11 and will enhance disclosures required by the United States Generally Accepted Accounting Principles (“U.S. GAAP”) by requiring additional information about financial and derivative instruments that are either (1) offset in accordance with Section 210-20-45 or Section 815-10-45 or (2) subject to an enforceable master netting arrangement or similar agreement, irrespective of whether they are offset in accordance with Section 210-20-45 or Section 815-10-45. We are required to apply the amendments for annual reporting periods beginning on or after January 1, 2013, and for interim periods within those annual periods. The Company adopted this standard on January 1, 2013, and the adoption did not have a material impact on its Unaudited Condensed Consolidated Financial Statements.

In April 2013, the FASB issued ASU No. 2013-04: Liabilities (“ASU 2013-04”), which provides guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. ASU 2013-04 is effective for us beginning January 1, 2014. The Company does not anticipate the adoption of this guidance will have a material impact on its Unaudited Condensed Consolidated Financial Statements or disclosures.

In July 2013, the FASB issued ASU No. 2013-11: Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). The amendments in ASU 2013-11 are intended to end inconsistent practices regarding the presentation of unrecognized tax benefits on the balance sheet. An entity will be required to present an unrecognized tax benefit as a reduction of a deferred tax asset for a net operating loss (“NOL”) or tax credit carryforward whenever the NOL or tax credit carryforward would be available to reduce the additional taxable income or tax due if the tax position is disallowed. An entity is required to apply the amendments prospectively for annual reporting periods beginning after December 15, 2013, and for interim periods within those annual periods. Early adoption and retrospective application are permitted. The Company does not anticipate the adoption of this guidance will have a material impact on its Unaudited Condensed Consolidated Financial Statements or disclosures.