OTHER COMPREHENSIVE INCOME (LOSS)- Total comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity [Abstract]
Net income	$ 7,596	$ 10,893	$ 22,287	$ 23,486
Other comprehensive income (loss), net of taxes	2,469	5,363	10,911	(40,839)
Comprehensive loss	$ 10,065	$ 16,256	$ 33,198	$ (17,353)