Interest - Schedule of Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in inventory, beginning of period	$ 139,203	$ 138,108
Interest incurred	25,555	27,087
Interest expense not qualified for capitalization and included as other expense	(3,435)	(5,252)
Capitalized interest amortized to home construction and land sales expenses	(16,476)	(15,644)
Capitalized interest in inventory, end of period	$ 144,847	$ 144,299