Interest - Schedule of Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in inventory, beginning of period	$ 106,985	$ 119,659
Interest incurred	18,311	19,902
Interest expense not qualified for capitalization and included as other expense	0	(1,600)
Capitalized interest amortized to home construction and land sales expenses	(14,780)	(18,813)
Capitalized interest in inventory, end of period	$ 110,516	$ 119,148