CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 35,628	$ 45,158	$ (1,605)
Other comprehensive income (loss):
Unrealized gain (loss) on derivative instruments	3,047	(1,544)	(50)
Other comprehensive income (loss)	3,047	(1,544)	(50)
Comprehensive income (loss)	38,675	43,614	(1,655)
Comprehensive (income) attributable to non-controlling interests	(22,473)	(13,392)	(776)
Comprehensive income (loss) attributable to common stockholders	$ 16,202	$ 30,222	$ (2,431)