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COMMON STOCK EQUITY - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Oct. 01, 2018
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance as of beginning of period $ 1,418,978 $ 1,236,643  
Balance as of end of period 1,497,050 1,347,770  
Investments in Equity Securities      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance as of beginning of period 3,446 11,044  
Other comprehensive (loss), before reclassifications, net of tax   (2,290)  
Amounts reclassified from accumulated other comprehensive income, net of tax 0 (3,154)  
Net current-period other comprehensive income, net of tax 0 (5,444)  
Reclassification to retained earnings [1]     $ (3,446)
Balance as of end of period 0 5,600  
Tax on other comprehensive income (loss) before reclassifications   (851)  
Tax on amounts reclassified from accumulated other comprehensive income 0 (2,178)  
Tax on net current-period other comprehensive income (loss) 0 (3,029)  
Postemployment Benefit Obligation      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance as of beginning of period (16,056) (14,300)  
Other comprehensive (loss), before reclassifications, net of tax   0  
Amounts reclassified from accumulated other comprehensive income, net of tax [2] 234 240  
Net current-period other comprehensive income, net of tax 234 240  
Reclassification to retained earnings     0
Balance as of end of period (15,822) (14,060)  
Tax on other comprehensive income (loss) before reclassifications   0  
Tax on amounts reclassified from accumulated other comprehensive income 96 136  
Tax on net current-period other comprehensive income (loss) 96 136  
Total      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance as of beginning of period (12,610) (3,256)  
Other comprehensive (loss), before reclassifications, net of tax   (2,290)  
Amounts reclassified from accumulated other comprehensive income, net of tax 234 (2,914)  
Net current-period other comprehensive income, net of tax 234 (5,204)  
Reclassification to retained earnings     $ (3,446)
Balance as of end of period (15,822) (8,460)  
Tax on other comprehensive income (loss) before reclassifications   (851)  
Tax on amounts reclassified from accumulated other comprehensive income 96 (2,042)  
Tax on net current-period other comprehensive income (loss) $ 96 $ (2,893)  
[1] Due to the adoption of ASU No. 2016-01, an amendment to ASC 825, Financial Instruments. See Note 2. Summary of Significant Accounting Policies - Recently Adopted Updates to the Accounting Standards Codification section for more details.
[2] Included in the computation of net periodic pension cost, a component of operations and maintenance expense on the Unaudited Condensed Consolidated Statements of Operations.