CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (3,820)	$ 7,284	$ 23,784	$ 39,356
Other comprehensive (loss) income:
Unrealized (loss) gain on derivative instruments	(228)	(855)	3,074	(869)
Other comprehensive (loss) income	(228)	(855)	3,074	(869)
Comprehensive (loss) income	(4,048)	6,429	26,858	38,487
Comprehensive loss (income) attributable to non-controlling interests	1,260	(1,507)	(16,099)	(10,675)
Comprehensive (loss) income attributable to common stockholders	$ (2,788)	$ 4,922	$ 10,759	$ 27,812