| Cover Page Cover Page | Oct. 23, 2019 |
| Cover page. [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 23, 2019 |
| Entity Registrant Name | M/I HOMES, INC. |
| Entity Incorporation, State or Country Code | OH |
| Entity File Number | 1-12434 |
| Entity Tax Identification Number | 31-1210837 |
| Entity Address, Address Line One | 3 Easton Oval |
| Entity Address, Address Line Two | Suite 500 |
| Entity Address, City or Town | Columbus |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 43219 |
| City Area Code | 614 |
| Local Phone Number | 418-8000 |
| Title of 12(b) Security | Common Shares, par value $.01 |
| Trading Symbol | MHO |
| Security Exchange Name | NYSE |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000799292 |
| Amendment Flag | false |
