Basis of Presentation and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 363,491	$ 468,953
Customer deposits	15,272		$ 14,260
Contract with customer, liability, revenue recognized	7,100
Homebuilding revenue
Disaggregation of Revenue [Line Items]
Total revenue	359,742	460,422
Land sales and other revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,749	$ 8,531