Description of Business (Details)	Sep. 30, 2018 state region
Description of Business [Abstract]
Number of states in which home building segments operate \| state	13
Number of regions in which entity operates \| region	3

The number of states the entity operates in as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant