Inventory and Capitalized Interest Other Inventory Items - Homes under construction not subject to a sale contract (Details) $ in Millions	Jun. 30, 2016 USD ($) homes	Dec. 31, 2015 USD ($)
Other Inventory, Gross [Abstract]
Number of Speculative Homes	877	872
Speculative Homes Carrying Value	$ 142.6	$ 184.3

The number of speculative units (homes not subject to a sales contract) included in homes under construction.

No definition available.

Name:	mho_NumberOfSpeculativeHomes
Namespace Prefix:	mho_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant