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COMMON STOCK EQUITY (Tables) | 6 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Changes in Common Stock Equity | Changes in common stock equity during the six months ended March 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, 2017 | 86,556 |  | $ | 222,258 |  | $ | 219,696 |  |  | $ | (3,256 | ) |  | $ | (70,039 | ) | $ | 867,984 |  | $ | 1,236,643 |
Net income |  |  |  |  |  |  |  | 263,965 |  | 263,965 |
Other comprehensive loss |  |  |  |  | (10,532 | ) |  |  |  | (10,532 | )
Common stock issued: |  |  |  |  |  |  |  |  |
Incentive plan | 555 |  | 1,531 |  | 14,998 |  |  |  |  |  |  |  | 16,529 |
Dividend reinvestment plan (1) | 242 |  |  | 172 |  |  |  |  | 9,583 |  |  | 9,755 |
Waiver discount | 554 |  | 1,384 |  | 21,306 |  |  |  |  |  |  | 22,690 |
Cash dividend declared ($.545 per share) |  |  |  |  |  |  |  | (47,717 | ) | (47,717 | )
Treasury stock and other | (251 | ) |  | (14 | ) |  |  |  | (23,945 | ) |  | (23,959 | )
Balance at March 31, 2018 | 87,656 |  | $ | 225,173 |  | $ | 256,158 |  |  | $ | (13,788 | ) |  | $ | (84,401 | ) | $ | 1,084,232 |  | $ | 1,467,374 |
(1) | Shares sold through the DRP are issued from treasury stock at average cost, which may differ from the actual market price paid.
Schedule of 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 March 31, 2018 and 2017:
(Thousands) | Available for Sale Securities | Postemployment Benefit Obligation | Total
Balance at December 31, 2017 | $ | 5,600 |  |  | $ | (14,060 | ) |  | $ | (8,460 | )
Other comprehensive (loss) income, net of tax |  |  |  |  |
Other comprehensive (loss),before reclassifications, net of tax of $7,366, $0, $7,366 | (20,401 | ) |  | — |  |  | (20,401 | )
Amounts reclassified from accumulated other comprehensive income, net of tax of $(3,036), $(104), $(3,140) | 14,801 |  |  | 272 |  | (1) | 15,073 |
Net current-period other comprehensive (loss) income, net of tax of $4,330, $(104), $4,226 | (5,600 | ) |  | 272 |  |  | (5,328 | )
Balance at March 31, 2018 | $ | — |  |  | $ | (13,788 | ) |  | $ | (13,788 | )
Balance at December 31, 2016 | $ | 9,713 |  |  | $ | (19,036 | ) |  | $ | (9,323 | )
Other comprehensive income, net of tax |  |  |  |  |
Other comprehensive income, before reclassifications, net of tax of $(1,808), $0, $(1,808) | 3,054 |  |  | — |  |  | 3,054 |
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax of $1,138, $(217), $921 | (1,646 | ) |  | 318 |  | (1) | (1,328 | )
Net current-period other comprehensive income, net of tax of $(670), $(217), $(887) | 1,408 |  |  | 318 |  |  | 1,726 |
Balance as of March 31, 2017 | $ | 11,121 |  |  | $ | (18,718 | ) |  | $ | (7,597 | )
The following table presents the changes in the components of accumulated other comprehensive income (loss), net of related tax effects during the six months ended March 31, 2018 and 2017:
(Thousands) | Available for Sale Securities | Postemployment Benefit Obligation | Total
Balance at September 30, 2017 | $ | 11,044 |  |  | $ | (14,300 | ) |  | $ | (3,256 | )
Other comprehensive (loss) income, net of tax |  |  |  |  |
Other comprehensive (loss), before reclassifications, net of tax of $8,217, $0, $8,217 | (22,691 | ) |  | — |  |  | (22,691 | )
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax of $(858), $(240), $(1,098) | 11,647 |  |  | 512 |  | (1) | 12,159 |
Net current-period other comprehensive (loss) income, net of tax of $7,359, $(240), $7,119 | (11,044 | ) |  | 512 |  |  | (10,532 | )
Balance at March 31, 2018 | $ | — |  |  | $ | (13,788 | ) |  | $ | (13,788 | )
Balance as of September 30, 2016 | $ | 4,198 |  |  | $ | (19,353 | ) |  | $ | (15,155 | )
Other comprehensive income (loss), net of tax |  |  |  |  |
Other comprehensive income, before reclassifications, net of tax of $(6,648), $0, $(6,648) | 10,096 |  |  | — |  |  | 10,096 |
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax of $2,192, $(434), $1,758 | (3,173 | ) |  | 635 |  | (1) | (2,538 | )
Net current-period other comprehensive income, net of tax of $(4,456), $(434), $(4,890) | 6,923 |  |  | 635 |  |  | 7,558 |
Balance as of March 31, 2017 | $ | 11,121 |  |  | $ | (18,718 | ) |  | $ | (7,597 | )
(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.

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