Interest - Schedule of Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in inventory, beginning of period	$ 144,645	$ 139,203
Interest incurred	24,921	25,555
Capitalized interest impaired	(115)	0
Interest expense not qualified for capitalization and included as other expense	(242)	(3,435)
Capitalized interest amortized to home construction and land sales expenses	(17,323)	(16,476)
Capitalized interest in inventory, end of period	$ 151,886	$ 144,847