Basis of Presentation and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 526,666	$ 570,932	$ 1,489,321	$ 1,549,360
Customer deposits	44,055		44,055		$ 28,526
Contract with customer, liability, revenue recognized	5,400		23,100
Homebuilding revenue
Disaggregation of Revenue [Line Items]
Total revenue	523,229	566,930	1,477,166	1,538,576
Land sales and other revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,437	$ 4,002	$ 12,155	$ 10,784