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COMMON STOCK EQUITY - ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  |  | $ 1,106,956 |
Other comprehensive income (loss) |  | $ 4,795 | $ (193) | 8,719 | $ 682
Balance as of end of period |  | 1,207,482 |  | 1,207,482 |
Available for Sale Securities [Member] |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  |  | 6,385 | 4,782
Other comprehensive income (loss), before reclassifications, net of tax |  |  |  | 8,201 | 109
Amounts reclassified from accumulated other comprehensive income, net of tax |  |  |  | 0 | 0
Other comprehensive income (loss) |  |  |  | 8,201 | 109
Balance as of end of period |  | 14,586 | 4,891 | 14,586 | 4,891
Tax on other comprehensive income (loss) before reclassifications |  |  |  | 5,768 | 75
Tax on amounts reclassified from accumulated other comprehensive income |  |  |  | 0 | 0
Tax on net current-period other comprehensive income (loss) |  |  |  | 5,768 | 75
Cash Flow Hedges [Member] |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  |  | 0 | (93)
Other comprehensive income (loss), before reclassifications, net of tax |  |  |  | (22) | (256)
Amounts reclassified from accumulated other comprehensive income, net of tax | [1] |  |  | 27 | 343
Other comprehensive income (loss) |  |  |  | 5 | 87
Balance as of end of period |  | 5 | (6) | 5 | (6)
Tax on other comprehensive income (loss) before reclassifications |  |  |  | (13) | (149)
Tax on amounts reclassified from accumulated other comprehensive income |  |  |  | 15 | 199
Tax on net current-period other comprehensive income (loss) |  |  |  | 2 | 50
Postemployment Benefit Obligation [Member] |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  |  | (15,779) | (10,283)
Other comprehensive income (loss), before reclassifications, net of tax |  |  |  | 0 | 0
Amounts reclassified from accumulated other comprehensive income, net of tax | [2] |  |  | 513 | 486
Other comprehensive income (loss) |  |  |  | 513 | 486
Balance as of end of period |  | (15,266) | (9,797) | (15,266) | (9,797)
Tax on other comprehensive income (loss) before reclassifications |  |  |  | 0 | 0
Tax on amounts reclassified from accumulated other comprehensive income |  |  |  | 349 | 337
Tax on net current-period other comprehensive income (loss) |  |  |  | 349 | 337
Total [Member] |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  |  | (9,394) | (5,594)
Other comprehensive income (loss), before reclassifications, net of tax |  |  |  | 8,179 | (147)
Amounts reclassified from accumulated other comprehensive income, net of tax |  |  |  | 540 | 829
Other comprehensive income (loss) |  |  |  | 8,719 | 682
Balance as of end of period |  | $ (675) | $ (4,912) | (675) | (4,912)
Tax on other comprehensive income (loss) before reclassifications |  |  |  | 5,755 | (74)
Tax on amounts reclassified from accumulated other comprehensive income |  |  |  | 364 | 536
Tax on net current-period other comprehensive income (loss) |  |  |  | $ 6,119 | $ 462
[1] | Consists of realized losses related to foreign currency derivatives, which are reclassified to gas purchases on the Unaudited Condensed Consolidated Statements of Operations.
[2] | 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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