Supplemental Cash Flow Information - Supplemental Disclosure of Non-cash Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Supplemental disclosure of non-cash activity:
Non-cash land acquisitions	$ 5,197	$ 3,769
Land acquisitions for debt	5,555	0
Supplemental disclosure of cash activity:
Interest payments	11,824	39,740
Income tax payments	178	146
Tax refunds received	$ 4	$ 150