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COMMON STOCK EQUITY (Tables) | 3 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Changes in Common Stock Equity | Changes in common stock equity during the three months ended December 31, 2018, were as follows:
(Thousands) | Number of Shares | Common Stock | Premium on Common Stock | Accumulated Other Comprehensive (Loss) Income | Treasury Stock And Other | Retained Earnings | Total
Balance at September 30, 2018 | 88,293 |  | $ | 226,196 |  | $ | 274,748 |  |  | $ | (12,610 | ) |  | $ | (76,473 | ) | $ | 1,007,117 |  | $ | 1,418,978 |
Net income |  |  |  |  |  |  |  | 86,248 |  | 86,248 |
Other comprehensive income |  |  |  |  | 234 |  |  |  |  | 234 |
Common stock issued: |  |  |  |  |  |  |  |  |
Incentive compensation plan | 137 |  | 343 |  | 1,791 |  |  |  |  |  |  |  | 2,134 |
Dividend reinvestment plan (1) | 82 |  |  | 454 |  |  |  |  | 3,238 |  |  | 3,692 |
Waiver discount | 168 |  | — |  | 1,293 |  |  |  |  | 6,671 |  |  | 7,964 |
Cash dividend declared ($.2925 per share) |  |  |  |  |  |  |  | (25,938 | ) | (25,938 | )
Treasury stock and other | — |  |  | — |  |  |  |  | 1,504 |  |  | 1,504 |
Adoption of ASU 2016-01 (2) |  |  |  |  |  | (3,446 | ) |  |  |  | 3,446 |  | — |
Adoption of ASU 2017-05 (2) |  |  |  |  |  |  |  |  |  | 4,970 |  | 4,970 |
Adoption of ASU 2014-09/ASC 606 (2) |  |  |  |  |  |  |  |  |  | (2,736 | ) | (2,736 | )
Balance at December 31, 2018 | 88,680 |  | $ | 226,539 |  | $ | 278,286 |  |  | $ | (15,822 | ) |  | $ | (65,060 | ) | $ | 1,073,107 |  | $ | 1,497,050 |
Balance at September 30, 2017 | 86,556 |  | $ | 222,258 |  | $ | 219,696 |  |  | $ | (3,256 | ) |  | $ | (70,039 | ) | $ | 867,984 |  | $ | 1,236,643 |
Net income |  |  |  |  |  |  |  | 123,699 |  | 123,699 |
Other comprehensive income |  |  |  |  | (5,204 | ) |  |  |  | (5,204 | )
Common stock issued: |  |  |  |  |  |  |  |  |
Incentive plan | 525 |  | 1,453 |  | 13,951 |  |  |  |  |  |  | 15,404 |
Dividend reinvestment plan (1) | 90 |  |  | 245 |  |  |  |  | 3,554 |  |  | 3,799 |
Waiver discount | 554 |  | 1,384 |  | 21,306 |  |  |  |  |  |  | 22,690 |
Cash dividend declared ($.2725 per share) |  |  |  |  |  |  |  | (23,831 | ) | (23,831 | )
Treasury stock and other | (250 | ) |  | (56 | ) |  |  |  | (25,374 | ) |  | (25,430 | )
Balance at December 31, 2017 | 87,475 |  | $ | 225,095 |  | $ | 255,142 |  |  | $ | (8,460 | ) |  | $ | (91,859 | ) | $ | 967,852 |  | $ | 1,347,770 |
(1) | Shares sold through the DRP are issued from treasury stock at average cost, which may differ from the actual market price paid.
(2) | See Note 2. Summary of Significant Accounting Policies - Recently Adopted Updates to the Accounting Standards Codification section for more details.
Schedule of Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) The following table presents the changes in the components of accumulated other comprehensive income (loss), net of related tax effects during the three months ended December 31, 2018 and 2017:
(Thousands) | Investments in Equity Securities | Postemployment Benefit Obligation | Total
Balance at September 30, 2018 | $ | 3,446 |  |  | $ | (16,056 | ) |  | $ | (12,610 | )
Other comprehensive income, net of tax |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(96), $(96) | — |  |  | 234 |  | (1) | 234 |
Net current-period other comprehensive income, net of tax of $0, $(96), $(96) | — |  |  | 234 |  |  | 234 |
Reclassification to retained earnings | (3,446 | ) | (2) | — |  |  | (3,446 | )
Balance at December 31, 2018 | $ | — |  |  | $ | (15,822 | ) |  | $ | (15,822 | )
Balance as of September 30, 2017 | $ | 11,044 |  |  | $ | (14,300 | ) |  | $ | (3,256 | )
Other comprehensive income (loss), net of tax |  |  |  |  |
Other comprehensive (loss), before reclassifications, net of tax of $851, $0, $851 | (2,290 | ) |  | — |  |  | (2,290 | )
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax of $2,178, $(136), $2,042 | (3,154 | ) |  | 240 |  | (1) | (2,914 | )
Net current-period other comprehensive (loss) income, net of tax of $3,029, $(136), $2,893 | (5,444 | ) |  | 240 |  |  | (5,204 | )
Balance as of December 31, 2017 | $ | 5,600 |  |  | $ | (14,060 | ) |  | $ | (8,460 | )
(1) | Included in the computation of net periodic pension cost, a component of operations and maintenance expense on the Unaudited Condensed Consolidated Statements of Operations.
(2) | 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.

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