OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Total Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income (loss)	$ 10,803	$ 10,893	$ 5,122	$ 7,471	$ 7,948	$ 14,464	$ (25,825)	$ 3,236	$ 34,289	$ (177)	$ 3,767
Other comprehensive income (loss), net of taxes									(61,124)	(26,725)	16,220
Comprehensive income (loss)									$ (26,835)	$ (26,902)	$ 19,987