Inventory and Capitalized Interest Other Inventory Items - Homes under construction not subject to a sale contract (Details) $ in Millions	Jun. 30, 2015 USD ($) homes	Dec. 31, 2014 USD ($)
Other Inventory, Gross [Abstract]
Number of Speculative Homes	917	979
Speculative Homes Carrying Value	$ 157.7	$ 186.7

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