Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in inventory, beginning of period	$ 106,985	$ 119,659	$ 136,565
Interest incurred	74,161	77,397	87,224
Capitalized interest impaired	(439)	0	(792)
Interest expense not qualified for capitalization and included as other expense	0	(2,781)	(8,468)
Capitalized interest amortized to home construction and land sales expenses	(71,619)	(87,290)	(94,870)
Capitalized interest in inventory, end of period	$ 109,088	$ 106,985	$ 119,659