Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) home	Sep. 30, 2019 USD ($) lot	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Oct. 01, 2019 USD ($)
Summary of Significant Accounting Policies [Line Items]
Threshold number of homes below a minimum threshold of profitability		10	10
Measurement threshold of likelihood of being realized (percent)				50.00%
Customer deposits	$ 11,539	$ 11,539	$ 11,539	$ 11,539	$ 11,539	$ 14,903
Contract with customer, liability, revenue recognized					13,500
Refunded by buyer					1,300
Contract with customer, liability, remaining liability	$ 100	$ 100	$ 100	$ 100	100
Advertising costs					$ 17,900	17,600	$ 17,500
Accounting Standards Update 2016-02 | Subsequent Event
Summary of Significant Accounting Policies [Line Items]
Lease liabilities								$ 18,000
Accounting Standards Update 2016-15
Summary of Significant Accounting Policies [Line Items]
Payment for debt extinguishment cost						$ 24,600	$ 9,000
Minimum
Summary of Significant Accounting Policies [Line Items]
Estimated time to develop, sell, construct and close all homes (in years)	3 years
Estimated future warranty costs as a percentage or revenue (percent)				0.30%
Maximum
Summary of Significant Accounting Policies [Line Items]
Estimated time to develop, sell, construct and close all homes (in years)	5 years
Estimated future warranty costs as a percentage or revenue (percent)				1.30%