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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  | $ (5,594) | $ (1,621) |
Other comprehensive (loss), before reclassifications, net of tax |  | (5,136) | (5,897) |
Amounts reclassified from accumulated other comprehensive income, net of tax |  | 1,336 | 1,924 |
Other comprehensive (loss) income |  | (3,800) | (3,973) | $ 9,150
Balance at end of period |  | (9,394) | (5,594) | (1,621)
Tax on other comprehensive income before reclassifications |  | 3,373 | 3,919 |
Tax on amounts reclassified from accumulated other comprehensive income |  | (876) | (1,270) |
Tax on net current-period other comprehensive income (loss) |  | 2,497 | 2,649 |
Unrealized Gain on Available for Sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  | 4,782 | 5,400 |
Other comprehensive (loss), before reclassifications, net of tax |  | 1,603 | (618) |
Amounts reclassified from accumulated other comprehensive income, net of tax |  | 0 | 0 |
Other comprehensive (loss) income |  | 1,603 | (618) |
Balance at end of period |  | 6,385 | 4,782 | 5,400
Tax on other comprehensive income before reclassifications |  | (1,135) | 426 |
Tax on amounts reclassified from accumulated other comprehensive income |  | 0 | 0 |
Tax on net current-period other comprehensive income (loss) |  | (1,135) | 426 |
Net Unrealized Gain on Derivatives [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  | (93) | 12 |
Other comprehensive (loss), before reclassifications, net of tax |  | (256) | (273) |
Amounts reclassified from accumulated other comprehensive income, net of tax | [1] | 349 | 168 |
Other comprehensive (loss) income |  | 93 | (105) |
Balance at end of period |  | 0 | (93) | 12
Tax on other comprehensive income before reclassifications |  | 146 | 159 |
Tax on amounts reclassified from accumulated other comprehensive income |  | (202) | (98) |
Tax on net current-period other comprehensive income (loss) |  | (56) | 61 |
Adjustment to Postemployment Benefit Obligation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  | (10,283) | (7,033) |
Other comprehensive (loss), before reclassifications, net of tax |  | (6,483) | (5,006) |
Amounts reclassified from accumulated other comprehensive income, net of tax | [2] | 987 | 1,756 |
Other comprehensive (loss) income |  | (5,496) | (3,250) |
Balance at end of period |  | (15,779) | (10,283) | $ (7,033)
Tax on other comprehensive income before reclassifications |  | 4,362 | 3,334 |
Tax on amounts reclassified from accumulated other comprehensive income |  | (674) | (1,172) |
Tax on net current-period other comprehensive income (loss) |  | $ 3,688 | $ 2,162 |
[1] | Consists of realized losses related to foreign currency derivatives, which are reclassified to gas purchases on the Consolidated Statements of Operations.
[2] | Included in the computation of net periodic pension cost, a component of O&M expense on the Consolidated Statements of Operations. For more details, see Note 10. Employee Benefit Plans.

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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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