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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.

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