Debt Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Debt Obligations
Deferred mortgage costs	$ (7,141)	$ (6,275)
Total debt obligations, net of deferred costs	728,350	652,507
Mortgage payable held for sale	0	27,052
Mortgages payable
Debt Obligations
Total debt obligations, net of deferred costs	698,091	621,382
Deferred mortgage costs	(6,754)	(5,873)
Junior subordinated notes
Debt Obligations
Total debt obligations, net of deferred costs	37,400	37,400
Deferred mortgage costs	$ (387)	$ (402)