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COMMON STOCK EQUITY - CHANGE IN COMMON STOCK EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Oct. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period (shares) |  | 88,292,956 |  |
Balance as of beginning of period |  | $ 1,418,978 | $ 1,236,643 |
Net income |  | 86,248 | 123,699 |
Other comprehensive income |  | 234 | (5,204) |
Common stock issued: |  |  |  |
Incentive plan |  | $ 2,134 | $ 15,404 |
Dividend reinvestment plan (in shares) |  | 82,000 | 90,000 |
Dividend reinvestment plan | [1] | $ 3,692 | $ 3,799 |
Waiver discount (in shares) |  | 168,000 | 554,000 |
Waiver discount |  | $ 7,964 | $ 22,690 |
Cash dividend declared |  | (25,938) | (23,831) |
Treasury stock and other |  | $ 1,504 | 25,430 |
Balance as of end of period (shares) |  | 88,680,174 |  |
Balance as of end of period |  | $ 1,497,050 | $ 1,347,770 |
Cash dividend declared per share (usd per share) |  | $ 0.2925 | $ 0.2725 |
Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period (shares) |  | 88,293,000 | 86,556,000 |
Balance as of beginning of period |  | $ 226,196 | $ 222,258 |
Common stock issued: |  |  |  |
Incentive plan (in shares) |  | 137,000 | 525,000 |
Incentive plan |  | $ 343 | $ 1,453 |
Dividend reinvestment plan (in shares) | [1] | 82,000 | 90,000 |
Waiver discount (in shares) |  | 168,000 | 554,000 |
Waiver discount |  | $ 0 | $ 1,384 |
Treasury stock and other (shares) |  | 0 | (250,000) |
Balance as of end of period (shares) |  | 88,680,000 | 87,475,000 |
Balance as of end of period |  | $ 226,539 | $ 225,095 |
Premium on Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  | 274,748 | 219,696 |
Common stock issued: |  |  |  |
Incentive plan |  | 1,791 | 13,951 |
Dividend reinvestment plan | [1] | 454 | 245 |
Waiver discount |  | 1,293 | 21,306 |
Treasury stock and other |  | 0 | 56 |
Balance as of end of period |  | 278,286 | 255,142 |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  | (12,610) | (3,256) |
Other comprehensive income |  | 234 | (5,204) |
Common stock issued: |  |  |  |
Adoption of ASU |  |  |  | $ (3,446)
Balance as of end of period |  | (15,822) | (8,460) |
Treasury Stock And Other |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  | (76,473) | (70,039) |
Common stock issued: |  |  |  |
Dividend reinvestment plan | [1] | 3,238 | 3,554 |
Waiver discount |  | 6,671 |  |
Treasury stock and other |  | 1,504 | 25,374 |
Balance as of end of period |  | (65,060) | (91,859) |
Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance as of beginning of period |  | 1,007,117 | 867,984 |
Net income |  | 86,248 | 123,699 |
Common stock issued: |  |  |  |
Cash dividend declared |  | (25,938) | (23,831) |
Balance as of end of period |  | $ 1,073,107 | $ 967,852 |
Accounting Standards Update 2016-01 |  |  |  |
Common stock issued: |  |  |  |
Adoption of ASU | [2] |  |  | 0
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive (Loss) Income |  |  |  |
Common stock issued: |  |  |  |
Adoption of ASU | [2] |  |  | (3,446)
Accounting Standards Update 2016-01 | Retained Earnings |  |  |  |
Common stock issued: |  |  |  |
Adoption of ASU | [2] |  |  | 3,446
Accounting Standards Update 2017-05 |  |  |  |
Common stock issued: |  |  |  |
Adoption of ASU | [2] |  |  | 4,970
Accounting Standards Update 2014-09/ASC 606 |  |  |  |
Common stock issued: |  |  |  |
Adoption of ASU | [2] |  |  | (2,736)
Accounting Standards Update 2014-09/ASC 606 | Retained Earnings |  |  |  |
Common stock issued: |  |  |  |
Adoption of ASU | [2] |  |  | $ (2,736)
[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.

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