DEI Document - shares	3 Months Ended
	Mar. 31, 2019	Apr. 24, 2019
Entity Information [Line Items]
Entity Registrant Name	M I HOMES INC
Entity Central Index Key	0000799292
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Entity Small Business	false
Entity Emerging Growth Company	false
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		27,568,826
Entity Current Reporting Status	Yes