Operating Leases - Narrative (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2025 USD ($) model_home	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Leases [Line Items]
Operating lease expense	$ 4,700	$ 4,400	$ 4,000
Operating lease payments	4,600	4,200	4,300
Gain on sale leaseback transaction	8,799	0	$ 0
Operating lease right-of-use assets	34,987	18,356
Operating lease liabilities	$ 27,762	$ 19,778
Model Homes
Leases [Line Items]
Number of model homes sold | model_home	83
Revenue under sale-leaseback transaction	$ 45,000
Home construction expense on sale-leaseback transaction	38,300
Cash proceeds from sale leaseback transaction	36,200
Gain on sale leaseback transaction	8,800
Operating lease right-of-use assets	16,500
Operating lease liabilities	$ 7,700
Minimum | Model Homes
Leases [Line Items]
Term of sale-leaseback (in months)	12 months
Maximum | Model Homes
Leases [Line Items]
Term of sale-leaseback (in months)	54 months