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COMMON STOCK EQUITY - CHANGE IN COMMON STOCK EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance as of beginning of period (shares)       86,086,355  
Balance as of beginning of period       $ 1,166,591  
Net income   $ 114,702 $ 73,353 149,631 $ 123,635
Other comprehensive income   $ 1,726 $ 4,795 7,558 $ 8,719
Common stock issued:          
Incentive plan       $ 5,369  
Dividend reinvestment plan (in shares) 5,000,000     279,000 260,000
Dividend reinvestment plan       $ 9,728  
Cash dividend declared ($.51 per share)       (44,003)  
Treasury stock and other       $ (8,594)  
Balance as of end of period (shares)   86,363,986   86,363,986  
Balance as of end of period   $ 1,286,280   $ 1,286,280  
Cash dividend declared per share (usd per share)   $ 0.255 $ 0.24 $ 0.51 $ 0.48
Common Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance as of beginning of period (shares)       86,086,000  
Balance as of beginning of period       $ 221,654  
Common stock issued:          
Incentive plan (in shares)       232,000  
Incentive plan       $ 581  
Dividend reinvestment plan (in shares)       279,000  
Treasury stock and other (shares)       (233,000)  
Balance as of end of period (shares)   86,364,000   86,364,000  
Balance as of end of period   $ 222,235   $ 222,235  
Premium on Common Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance as of beginning of period       215,580  
Common stock issued:          
Incentive plan       4,788  
Dividend reinvestment plan       (1,266)  
Treasury stock and other       (28)  
Balance as of end of period   219,074   219,074  
Accumulated Other Comprehensive (Loss) Income          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance as of beginning of period   (9,323) $ (5,470) (15,155) $ (9,394)
Other comprehensive income       7,558  
Common stock issued:          
Balance as of end of period $ (5,470) (7,597) $ (675) (7,597) $ (675)
Treasury Stock And Other          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance as of beginning of period       (81,044)  
Common stock issued:          
Dividend reinvestment plan       10,994  
Treasury stock and other       (8,566)  
Balance as of end of period   (78,616)   (78,616)  
Retained Earnings          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance as of beginning of period       825,556  
Net income       149,631  
Common stock issued:          
Cash dividend declared ($.51 per share)       (44,003)  
Balance as of end of period   $ 931,184   $ 931,184