Interest - Schedule of Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in inventory, beginning of period	$ 140,139	$ 112,476	$ 123,457	$ 87,619
Interest incurred	28,758	30,748	89,313	91,290
Capitalized interest impaired	(626)	0	(710)	0
Interest expense not qualified for capitalization and included as other expense (a)	(5,406)	(5,954)	(19,471)	(23,396)
Capitalized interest amortized to house construction and land sales expenses (b)	(20,467)	(13,558)	(50,191)	(31,801)
Capitalized interest in inventory, end of period	$ 142,398	$ 123,712	$ 142,398	$ 123,712