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COMMON STOCK EQUITY - ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
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 |  | 3,660 | 644
Amounts reclassified from accumulated other comprehensive income, net of tax |  | 264 | 231
Other comprehensive income |  | 3,924 | 875
Balance as of end of period |  | (5,470) | (4,719)
Tax on other comprehensive income (loss) before reclassifications |  | 2,591 | 446
Tax on amounts reclassified from accumulated other comprehensive income |  | 178 | 160
Tax on net current-period other comprehensive income (loss) |  | 2,769 | 606
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 |  | 3,701 | 659
Amounts reclassified from accumulated other comprehensive income, net of tax |  | 0 | 0
Other comprehensive income |  | 3,701 | 659
Balance as of end of period |  | 10,086 | 5,441
Tax on other comprehensive income (loss) before reclassifications |  | 2,614 | 455
Tax on amounts reclassified from accumulated other comprehensive income |  | 0 | 0
Tax on net current-period other comprehensive income (loss) |  | 2,614 | 455
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 |  | (41) | (15)
Amounts reclassified from accumulated other comprehensive income, net of tax | [1] | 8 | (16)
Other comprehensive income |  | (33) | (31)
Balance as of end of period |  | (33) | (124)
Tax on other comprehensive income (loss) before reclassifications |  | (23) | (9)
Tax on amounts reclassified from accumulated other comprehensive income |  | 4 | (9)
Tax on net current-period other comprehensive income (loss) |  | (19) | (18)
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] | 256 | 247
Other comprehensive income |  | 256 | 247
Balance as of end of period |  | (15,523) | (10,036)
Tax on other comprehensive income (loss) before reclassifications |  | 0 | 0
Tax on amounts reclassified from accumulated other comprehensive income |  | 174 | 169
Tax on net current-period other comprehensive income (loss) |  | $ 174 | $ 169
[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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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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