Interest - Schedule of Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in inventory, beginning of period	$ 110,516	$ 119,148	$ 106,985	$ 119,659
Interest incurred	18,253	19,345	36,564	39,247
Interest expense not qualified for capitalization and included as other expense	0	(969)	0	(2,569)
Capitalized interest amortized to home construction and land sales expenses	(16,083)	(24,110)	(30,863)	(42,923)
Capitalized interest in inventory, end of period	$ 112,686	$ 113,414	$ 112,686	$ 113,414