Inventory - Schedule of Impairment Charges Taken on Projects in Progress (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026 USD ($) lot community	Mar. 31, 2025 USD ($)	Mar. 31, 2026 USD ($) community	Mar. 31, 2025 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
# of Communities Impaired | community	1		1
# of Lots Impaired | lot	37
Impairment Charge	$ 1,295	$ 0	$ 1,295	$ 0
Level 3 | Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value of Impaired Inventory at Time of Impairment	$ 5,597		5,597
Operating Segments | West
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
# of Communities Impaired | community	1
# of Lots Impaired | lot	37
Impairment Charge	$ 1,174	0	1,174	0
Operating Segments | West | Level 3 | Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value of Impaired Inventory at Time of Impairment	$ 5,072		5,072
Corporate and unallocated
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
# of Communities Impaired | community	0
# of Lots Impaired | lot	0
Impairment Charge	$ 121	$ 0	121	$ 0
Corporate and unallocated | Level 3 | Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated Fair Value of Impaired Inventory at Time of Impairment	$ 525		$ 525