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COMMON STOCK EQUITY - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period     $ 1,236,643  
Other comprehensive income (loss), before reclassifications, net of tax $ (2,364) $ (3,622) (25,055) $ 6,474
Amounts reclassified from accumulated other comprehensive income, net of tax 272 318 12,431 (2,220)
Other comprehensive (loss) income (2,092) (3,304) (12,624) 4,254
Balance as of end of period 1,449,962   1,449,962  
Available for Sale Securities        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period 0 11,121 11,044 4,198
Other comprehensive income (loss), before reclassifications, net of tax (2,364) (3,622) (25,055) 6,474
Amounts reclassified from accumulated other comprehensive income, net of tax 0 0 11,647 (3,173)
Other comprehensive (loss) income (2,364) (3,622) (13,408) 3,301
Balance as of end of period (2,364) 7,499 (2,364) 7,499
Tax on other comprehensive income (loss) before reclassifications (854) (2,375) (9,071) 4,273
Tax on amounts reclassified from accumulated other comprehensive income 0 0 858 (2,192)
Tax on net current-period other comprehensive income (loss) (854) (2,375) (8,213) 2,081
Postemployment Benefit Obligation        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period (13,788) (18,718) (14,300) (19,353)
Other comprehensive income (loss), before reclassifications, net of tax 0 0 0 0
Amounts reclassified from accumulated other comprehensive income, net of tax 272 318 784 953
Other comprehensive (loss) income 272 318 784 953
Balance as of end of period (13,516) (18,400) (13,516) (18,400)
Tax on other comprehensive income (loss) before reclassifications 0 0 0 0
Tax on amounts reclassified from accumulated other comprehensive income 104 217 344 651
Tax on net current-period other comprehensive income (loss) 104 217 344 651
Total        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period (13,788) (7,597) (3,256) (15,155)
Balance as of end of period (15,880) (10,901) (15,880) (10,901)
Tax on other comprehensive income (loss) before reclassifications (854) (2,375) (9,071) 4,273
Tax on amounts reclassified from accumulated other comprehensive income 104 217 1,202 (1,541)
Tax on net current-period other comprehensive income (loss) $ (750) $ (2,158) $ (7,869) $ 2,732