CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (5,971)	$ (3,820)	$ 52,139	$ 23,784
Other comprehensive income:
Unrealized gain (loss) on derivative instruments	398	(228)	2,032	3,074
Other comprehensive income (loss)	398	(228)	2,032	3,074
Comprehensive income	(5,573)	(4,048)	54,171	26,858
Comprehensive loss (income) attributable to non-controlling interests	1,160	1,260	(25,879)	(16,099)
Comprehensive (loss) income attributable to common stockholders	$ (4,413)	$ (2,788)	$ 28,292	$ 10,759