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COMMON STOCK EQUITY - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 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 $ (3,622) $ (5,308) 6,474 $ 2,871
Amounts reclassified from accumulated other comprehensive income, net of tax 318 246 (2,220) 786
Other comprehensive (loss) income (3,304) (5,062) 4,254 3,657
Balance as of end of period 1,284,601   1,284,601  
Available for Sale Securities        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period 11,121 14,586 4,198 6,385
Other comprehensive income (loss), before reclassifications, net of tax (3,622) (5,313) 6,474 2,888
Amounts reclassified from accumulated other comprehensive income, net of tax 0 0 (3,173) 0
Other comprehensive (loss) income (3,622) (5,313) 3,301 2,888
Balance as of end of period 7,499 9,273 7,499 9,273
Tax on other comprehensive income (loss) before reclassifications (2,375) (3,754) 4,273 2,014
Tax on amounts reclassified from accumulated other comprehensive income 0 0 (2,192) 0
Tax on net current-period other comprehensive income (loss) (2,375) (3,754) 2,081 2,014
Cash Flow Hedges        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period 0 5 0 0
Other comprehensive income (loss), before reclassifications, net of tax 0 5 0 (17)
Amounts reclassified from accumulated other comprehensive income, net of tax 0 (10) 0 17
Other comprehensive (loss) income 0 (5) 0 0
Balance as of end of period 0 0 0 0
Tax on other comprehensive income (loss) before reclassifications 0 3 0 (10)
Tax on amounts reclassified from accumulated other comprehensive income 0 (5) 0 10
Tax on net current-period other comprehensive income (loss) 0 (2) 0 0
Postemployment Benefit Obligation        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period (18,718) (15,266) (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 318 256 953 769
Other comprehensive (loss) income 318 256 953 769
Balance as of end of period (18,400) (15,010) (18,400) (15,010)
Tax on other comprehensive income (loss) before reclassifications 0 0 0 0
Tax on amounts reclassified from accumulated other comprehensive income 217 174 651 523
Tax on net current-period other comprehensive income (loss) 217 174 651 523
Total        
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]        
Balance as of beginning of period (7,597) (675) (15,155) (9,394)
Balance as of end of period (10,901) (5,737) (10,901) (5,737)
Tax on other comprehensive income (loss) before reclassifications (2,375) (3,751) 4,273 2,004
Tax on amounts reclassified from accumulated other comprehensive income 217 169 (1,541) 533
Tax on net current-period other comprehensive income (loss) $ (2,158) $ (3,582) $ 2,732 $ 2,537