DISCONTINUED OPERATIONS - Statement of Operations (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 23, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Expenses:
Gain on sale of partnership interest		$ 0	$ 15,467	$ 0
Newark Joint Venture | Discontinued operations
Revenues:
Rental and other revenue from real estate properties			2,437	4,335
Other income			444	1,067
Total revenues			2,881	5,402
Expenses:
Real estate operating expenses			2,277	4,610
Interest expense			2,242	4,880
Depreciation			1,150	2,241
Total expense			5,669	11,731
Income from discontinued operations			(2,788)	(6,329)
Gain on sale of partnership interest	$ 15,467		15,467	0
Discontinued operations			$ 12,679	$ (6,329)