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COMMON STOCK EQUITY - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period     $ 1,166,591  
Other comprehensive income (loss), before reclassifications, net of tax $ 3,054 $ 4,519 10,096 $ 8,179
Amounts reclassified from accumulated other comprehensive income, net of tax (1,328) 276 (2,538) 540
Other comprehensive income 1,726 4,795 7,558 8,719
Balance as of end of period 1,286,280   1,286,280  
Available for Sale Securities        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period 9,713 10,086 4,198 6,385
Other comprehensive income (loss), before reclassifications, net of tax 3,054 4,500 10,096 8,201
Amounts reclassified from accumulated other comprehensive income, net of tax (1,646) 0 (3,173) 0
Other comprehensive income 1,408 4,500 6,923 8,201
Balance as of end of period 11,121 14,586 11,121 14,586
Tax on other comprehensive income (loss) before reclassifications 1,808 3,154 6,648 5,768
Tax on amounts reclassified from accumulated other comprehensive income (1,138) 0 (2,192) 0
Tax on net current-period other comprehensive income (loss) 670 3,154 4,456 5,768
Cash Flow Hedges        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period 0 (33) 0 0
Other comprehensive income (loss), before reclassifications, net of tax 0 19 0 (22)
Amounts reclassified from accumulated other comprehensive income, net of tax 0 19 0 27
Other comprehensive income 0 38 0 5
Balance as of end of period 0 5 0 5
Tax on other comprehensive income (loss) before reclassifications 0 10 0 (13)
Tax on amounts reclassified from accumulated other comprehensive income 0 11 0 15
Tax on net current-period other comprehensive income (loss) 0 21 0 2
Postemployment Benefit Obligation        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period (19,036) (15,523) (19,353) (15,779)
Other comprehensive income (loss), before reclassifications, net of tax 0 0 0 0
Amounts reclassified from accumulated other comprehensive income, net of tax 318 257 635 513
Other comprehensive income 318 257 635 513
Balance as of end of period (18,718) (15,266) (18,718) (15,266)
Tax on other comprehensive income (loss) before reclassifications 0 0 0 0
Tax on amounts reclassified from accumulated other comprehensive income 217 175 434 349
Tax on net current-period other comprehensive income (loss) 217 175 434 349
Total        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period (9,323) (5,470) (15,155) (9,394)
Other comprehensive income     7,558  
Balance as of end of period (7,597) (675) (7,597) (675)
Tax on other comprehensive income (loss) before reclassifications 1,808 3,164 6,648 5,755
Tax on amounts reclassified from accumulated other comprehensive income (921) 186 (1,758) 364
Tax on net current-period other comprehensive income (loss) $ 887 $ 3,350 $ 4,890 $ 6,119