Interest - Schedule of Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in inventory, beginning of period	$ 119,659	$ 136,565
Interest incurred	19,902	21,556
Interest expense not qualified for capitalization and included as other expense	(1,600)	(1,442)
Capitalized interest amortized to home construction and land sales expenses	(18,813)	(19,669)
Capitalized interest in inventory, end of period	$ 119,148	$ 137,010