OTHER COMPREHENSIVE INCOME (LOSS)- Total comprehensive income (loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Equity [Abstract]
Net income	$ 5,122	$ (25,825)	$ 12,593	$ (22,589)
Other comprehensive income (loss), net of taxes	(30,019)	2,323	(46,202)	(498)
Comprehensive loss	$ (24,897)	$ (23,502)	$ (33,609)	$ (23,087)