Interest - Schedule of Capitalized Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Real Estate Inventory, Capitalized Interest Costs [Roll Forward]
Capitalized interest in inventory, beginning of period	$ 112,476	$ 72,256	$ 87,619	$ 52,562
Interest incurred	30,748	31,678	91,290	96,577
Interest expense not qualified for capitalization and included as other expense (a)	(5,954)	(10,421)	(23,396)	(41,112)
Capitalized interest amortized to house construction and land sales expenses (b)	(13,558)	(9,430)	(31,801)	(23,944)
Capitalized interest in inventory, end of period	$ 123,712	$ 84,083	$ 123,712	$ 84,083