Interest - Schedule of Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in inventory, beginning of period	$ 138,108	$ 123,457
Interest incurred	27,087	30,088
Interest expense not qualified for capitalization and included as other expense	(5,252)	(7,432)
Capitalized interest amortized to home construction and land sales expenses	(15,644)	(13,651)
Capitalized interest in inventory, end of period	$ 144,299	$ 132,462