Interest - Schedule of Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in inventory, beginning of period	$ 136,565	$ 144,645
Interest incurred	21,556	24,921
Capitalized interest impaired	0	(115)
Interest expense not qualified for capitalization and included as other expense	(1,442)	(242)
Capitalized interest amortized to home construction and land sales expenses	(19,669)	(17,323)
Capitalized interest in inventory, end of period	$ 137,010	$ 151,886