Supplemental Cash Flow Information Supplemental Disclosure of Non-cash Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Supplemental disclosure of non-cash activity:
Decrease in obligations related to land not owned under option agreements	$ 0	$ (2,916)
Land acquisitions for debt	8,265	12,904
Supplemental disclosure of cash activity:
Interest payments	60,998	59,702
Income tax payments	471	98
Tax refunds received	$ 67	0
Non-cash seller financing		7,800
Non-cash Land Acquisitions, Lot Takedown Costs		$ 5,100