XML 19 R1.htm IDEA: XBRL DOCUMENT v3.20.4
Cover Page - USD ($)
12 Months Ended
Dec. 31, 2020
Feb. 17, 2021
Jun. 30, 2020
Entity Information [Line Items]      
Document Annual Report true    
Document Transition Report false    
Document Type 10-K    
Document Period End Date Dec. 31, 2020    
Entity File Number 1-12434    
Entity Registrant Name M/I HOMES, INC.    
Entity Incorporation, State or Country Code OH    
Entity Tax Identification Number 31-1210837    
Entity Address, Address Line One 4131 Worth Avenue    
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    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 961,900,000
Entity Common Stock, Shares Outstanding   29,109,685  
Entity Central Index Key 0000799292    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false