Interest - Schedule of Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in inventory, beginning of period	$ 112,686	$ 113,414	$ 106,985	$ 119,659
Interest incurred	18,728	19,270	55,292	58,517
Interest expense not qualified for capitalization and included as other expense	0	(212)	0	(2,781)
Capitalized interest amortized to home construction and land sales expenses	(15,679)	(22,529)	(46,542)	(65,452)
Capitalized interest in inventory, end of period	$ 115,735	$ 109,943	$ 115,735	$ 109,943