Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Deferred tax assets:
Federal and state net operating loss carryforwards	$ 149,299	$ 177,611
Incentive compensation	12,914	13,793
Warranty and other reserves	7,091	6,006
Inventory adjustments	6,716	25,174
Intangible assets	1,515	6,016
Property, equipment and other assets	771	2,085
Uncertain tax positions	705	705
Other	2,743	2,435
Total deferred tax assets	181,754	233,825
Valuation allowance	(25,396)	(29,059)
Deferred tax assets, net	$ 156,358	$ 204,766