Owned Inventory - Impairment Charges Taken on Land Held for Sale (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025 USD ($) lot community	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) lot	Jun. 30, 2024 USD ($)
Segment Reporting Information [Line Items]
# of Communities Impaired | community	1
# of Lots Impaired | lot	38		38
Impairment Charge	$ 1,466	$ 0	$ 1,466	$ 0
Level 3 | Fair Value, Measurements, Nonrecurring
Segment Reporting Information [Line Items]
Estimated Fair Value Less Cost to Sell of Impaired Inventory at Time of Impairment	$ 3,686		3,686
Operating Segments | West
Segment Reporting Information [Line Items]
# of Communities Impaired | community	1
# of Lots Impaired | lot	38
Impairment Charge	$ 845	0	845	0
Operating Segments | West | Level 3 | Fair Value, Measurements, Nonrecurring
Segment Reporting Information [Line Items]
Estimated Fair Value Less Cost to Sell of Impaired Inventory at Time of Impairment	$ 3,686		3,686
Corporate and unallocated
Segment Reporting Information [Line Items]
# of Communities Impaired | community	0
# of Lots Impaired | lot	0
Impairment Charge	$ 621	$ 0	621	$ 0
Corporate and unallocated | Level 3 | Fair Value, Measurements, Nonrecurring
Segment Reporting Information [Line Items]
Estimated Fair Value Less Cost to Sell of Impaired Inventory at Time of Impairment	$ 0		$ 0