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COMMON STOCK EQUITY - CHANGE IN COMMON STOCK EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period (shares) |  |  | 86,555,507 |
Balance as of beginning of period |  |  | $ 1,236,643 |
Net income | $ (14,274) | $ 18,957 | 249,691 | $ 168,588
Other comprehensive income | $ (2,092) | $ (3,304) | (12,624) | $ 4,254
Common stock issued: |  |  |  |
Incentive plan |  |  | $ 16,537 |
Dividend reinvestment plan (in shares) | 92,000 | 102,000 | 334,000 | 381,000
Dividend reinvestment plan |  |  | $ 13,397 |
Waiver discount (in shares) | 460,000 |  | 1,014,000 |
Waiver discount |  |  | $ 41,677 |
Cash dividend ($.8175 per share) |  |  | (71,755) |
Treasury stock and other |  |  | $ (23,604) |
Balance as of end of period (shares) | 88,211,744 |  | 88,211,744 |
Balance as of end of period | $ 1,449,962 |  | $ 1,449,962 |
Cash dividend declared per share (usd per share) | $ 0.2725 | $ 0.255 | $ 0.8175 | $ 0.765
Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period (shares) |  |  | 86,556,000 |
Balance as of beginning of period |  |  | $ 222,258 |
Common stock issued: |  |  |  |
Incentive plan (in shares) |  |  | 558,000 |
Incentive plan |  |  | $ 1,396 |
Dividend reinvestment plan (in shares) |  |  | 334,000 |
Waiver discount (in shares) |  |  | 1,014,000 |
Waiver discount |  |  | $ 2,535 |
Treasury stock and other (shares) |  |  | (250,000) |
Balance as of end of period (shares) | 88,212,000 |  | 88,212,000 |
Balance as of end of period | $ 226,189 |  | $ 226,189 |
Premium on Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  |  | 219,696 |
Common stock issued: |  |  |  |
Incentive plan |  |  | 15,141 |
Dividend reinvestment plan |  |  | 173 |
Waiver discount |  |  | 39,142 |
Treasury stock and other |  |  | (14) |
Balance as of end of period | 274,138 |  | 274,138 |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period | (13,788) | $ (7,597) | (3,256) | $ (15,155)
Other comprehensive income |  |  | (12,624) |
Common stock issued: |  |  |  |
Balance as of end of period | (15,880) | $ (10,901) | (15,880) | $ (10,901)
Treasury Stock And Other |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  |  | (70,039) |
Common stock issued: |  |  |  |
Dividend reinvestment plan |  |  | 13,224 |
Treasury stock and other |  |  | (23,590) |
Balance as of end of period | (80,405) |  | (80,405) |
Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  |  | 867,984 |
Net income |  |  | 249,691 |
Common stock issued: |  |  |  |
Cash dividend ($.8175 per share) |  |  | (71,755) |
Balance as of end of period | $ 1,045,920 |  | $ 1,045,920 |

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