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)