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COMMON STOCK EQUITY (Tables) | 3 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Changes in Common Stock Equity | Changes in common stock equity during the three months ended December 31, 2017, 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 |  |  |  |  |  |  |  | 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.
Components of Accumulated Other Comprehensive Income (Loss), Net of Tax | 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, 2017 and 2016:
(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 $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 at December 31, 2017 | $ | 5,600 |  |  | $ | (14,060 | ) |  | $ | (8,460 | )
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 $(4,840), $0, $(4,840) | 7,042 |  |  | — |  |  | 7,042 |
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax of $1,054, $(217), $837 | (1,527 | ) |  | 317 |  | (1) | (1,210 | )
Net current-period other comprehensive income, net of tax of $(3,786), $(217), $(4,003) | 5,515 |  |  | 317 |  |  | 5,832 |
Balance as of December 31, 2016 | $ | 9,713 |  |  | $ | (19,036 | ) |  | $ | (9,323 | )
(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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