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COMMON STOCK EQUITY - CHANGE IN COMMON STOCK EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 14, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance as of beginning of period (shares) |  |  |  | 85,531,423 |
Balance as of beginning of period |  |  |  | $ 1,106,956 |
Net income |  | $ 73,328 | $ 60,903 | 121,975 | $ 184,223
Other comprehensive income |  | $ 4,795 | $ (193) | 8,719 | $ 682
Common stock issued: |  |  |  |  |
Incentive plan |  |  |  | $ 9,151 |
Dividend reinvestment plan (in shares) | 5,000,000 |  |  | 260,000 | 279,000
Dividend reinvestment plan |  |  |  | $ 8,198 |
Cash dividend declared ($.48 per share) |  |  |  | (41,227) |
Treasury stock and other |  |  |  | $ (6,290) |
Balance as of end of period (shares) |  | 85,968,887 |  | 85,968,887 |
Balance as of end of period |  | $ 1,207,482 |  | $ 1,207,482 |
Cash dividend declared per share (usd per share) |  | $ 0.24 | $ 0.23 | $ 0.48 | $ 0.45
Common Stock [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance as of beginning of period (shares) |  |  |  | 85,531,000 |
Balance as of beginning of period |  |  |  | $ 220,838 |
Common stock issued: |  |  |  |  |
Incentive plan (in shares) |  |  |  | 317,000 |
Incentive plan |  |  |  | $ 795 |
Dividend reinvestment plan (in shares) |  |  |  | 260,000 |
Treasury stock and other (shares) |  |  |  | (139,000) |
Balance as of end of period (shares) |  | 85,969,000 |  | 85,969,000 |
Balance as of end of period |  | $ 221,633 |  | $ 221,633 |
Premium on Common Stock [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  |  | 209,931 |
Common stock issued: |  |  |  |  |
Incentive plan |  |  |  | 8,356 |
Dividend reinvestment plan |  |  |  | (2,271) |
Treasury stock and other |  |  |  | (55) |
Balance as of end of period |  | 215,961 |  | 215,961 |
Accumulated Other Comprehensive (Loss) Income [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  |  | (9,394) | $ (5,594)
Other comprehensive income |  |  |  | 8,719 | 682
Common stock issued: |  |  |  |  |
Balance as of end of period |  | (675) | $ (4,912) | (675) | $ (4,912)
Treasury Stock And Other [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  |  | (92,164) |
Common stock issued: |  |  |  |  |
Dividend reinvestment plan |  |  |  | 10,469 |
Treasury stock and other |  |  |  | (6,235) |
Balance as of end of period |  | (87,930) |  | (87,930) |
Retained Earnings [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  |  | 777,745 |
Net income |  |  |  | 121,975 |
Common stock issued: |  |  |  |  |
Cash dividend declared ($.48 per share) |  |  |  | (41,227) |
Balance as of end of period |  | $ 858,493 |  | $ 858,493 |

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