Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Supplemental disclosure of non-cash activity:
Non-cash land acquisitions	$ 0	$ 0	$ 14,651
Supplemental disclosure of cash activity:
Interest payments	101,109	95,857	100,125
Income tax payments	766	607	1,616
Tax refunds received	12	162	351
Cash and cash equivalents	106,741	139,805	292,147
Restricted cash	16,053	13,443	12,462
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$ 122,794	$ 153,248	304,609	$ 243,276
Non-cash seller financing			6,300
Lot takedown costs			$ 8,400