CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Real estate operating expenses	$ 2,725	$ 1,950	$ 1,233
Property acquisition costs, related party	0	2,221	1,293
General and administrative, related party	$ 346	$ 157	$ 171