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COMMON STOCK EQUITY (Tables) | 9 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Changes in Common Stock Equity | Changes in common stock equity during the nine months ended June 30, 2018, were as follows:
(Thousands) | Number of Shares | Common Stock | Premium on Common Stock | Accumulated Other Comprehensive Loss | 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 |  |  |  |  |  |  |  | 249,691 |  | 249,691 |
Other comprehensive loss |  |  |  |  | (12,624 | ) |  |  |  | (12,624 | )
Common stock issued: |  |  |  |  |  |  |  |  |
Incentive plan | 558 |  | 1,396 |  | 15,141 |  |  |  |  |  |  |  | 16,537 |
Dividend reinvestment plan (1) | 334 |  |  | 173 |  |  |  |  | 13,224 |  |  | 13,397 |
Waiver discount | 1,014 |  | 2,535 |  | 39,142 |  |  |  |  |  |  | 41,677 |
Cash dividend ($.8175 per share) |  |  |  |  |  |  |  | (71,755 | ) | (71,755 | )
Treasury stock and other | (250 | ) |  | (14 | ) |  |  |  | (23,590 | ) |  | (23,604 | )
Balance at June 30, 2018 | 88,212 |  | $ | 226,189 |  | $ | 274,138 |  |  | $ | (15,880 | ) |  | $ | (80,405 | ) | $ | 1,045,920 |  | $ | 1,449,962 |
(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 (loss) income, net of related tax effects during the three months ended June 30, 2018 and 2017:
(Thousands) | Available for Sale Securities | Postemployment Benefit Obligation | Total
Balance at March 31, 2018 | $ | — |  |  | $ | (13,788 | ) |  | $ | (13,788 | )
Other comprehensive (loss) income, net of tax |  |  |  |  |
Other comprehensive (loss),before reclassifications, net of tax of $854, $0, $854 | (2,364 | ) |  | — |  |  | (2,364 | )
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(104), $(104) | — |  |  | 272 |  | (1) | 272 |
Net current-period other comprehensive (loss) income, net of tax of $854, $(104), $750 | (2,364 | ) |  | 272 |  |  | (2,092 | )
Balance at June 30, 2018 | $ | (2,364 | ) |  | $ | (13,516 | ) |  | $ | (15,880 | )
Balance at March 31, 2017 | $ | 11,121 |  |  | $ | (18,718 | ) |  | $ | (7,597 | )
Other comprehensive income, net of tax |  |  |  |  |
Other comprehensive (loss),before reclassifications, net of tax of $2,375, $0, $2,375 | (3,622 | ) |  | — |  |  | (3,622 | )
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(217), $(217) | — |  |  | 318 |  | (1) | 318 |
Net current-period other comprehensive (loss) income, net of tax of $2,375, $(217), $2,158 | (3,622 | ) |  | 318 |  |  | (3,304 | )
Balance as of June 30, 2017 | $ | 7,499 |  |  | $ | (18,400 | ) |  | $ | (10,901 | )
The following table presents the changes in the components of accumulated other comprehensive income (loss), net of related tax effects during the nine months ended June 30, 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 $9,071, $0, $9,071 | (25,055 | ) |  | — |  |  | (25,055 | )
Amounts reclassified from accumulated other comprehensive income, net of tax of $(858), $(344), $(1,202) | 11,647 |  |  | 784 |  | (1) | 12,431 |
Net current-period other comprehensive (loss) income, net of tax of $8,213, $(344), $7,869 | (13,408 | ) |  | 784 |  |  | (12,624 | )
Balance at June 30, 2018 | $ | (2,364 | ) |  | $ | (13,516 | ) |  | $ | (15,880 | )
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 $(4,273), $0, $(4,273) | 6,474 |  |  | — |  |  | 6,474 |
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax of $2,192, $(651), $1,541 | (3,173 | ) |  | 953 |  | (1) | (2,220 | )
Net current-period other comprehensive income, net of tax of $(2,081), $(651), $(2,732) | 3,301 |  |  | 953 |  |  | 4,254 |
Balance as of June 30, 2017 | $ | 7,499 |  |  | $ | (18,400 | ) |  | $ | (10,901 | )
(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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