Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Supplemental disclosure of non-cash activity:
Non-cash land acquisitions	$ 0	$ 14,651	$ 8,265
Supplemental disclosure of cash activity:
Interest payments	95,857	100,125	131,730
Income tax payments	607	1,616	1,420
Tax refunds received	162	351	201
Cash and cash equivalents	139,805	292,147	228,871
Restricted cash	13,443	12,462	14,405
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 153,248	304,609	$ 243,276	$ 290,484
Non-cash seller financing		6,300
Lot takedown costs		$ 8,400