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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | $ 1,106,956 | $ 966,166 | $ 887,384
Other comprehensive (loss) |  | (5,761) | (3,800) | (3,973)
Ending Balance |  | 1,166,591 | 1,106,956 | 966,166
Unrealized gain (loss) on available for sale securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | 6,385 | 4,782 |
Other comprehensive income (loss), before reclassifications, net of tax |  | (2,187) | 1,603 |
Amounts reclassified from accumulated other comprehensive income, net of tax |  | 0 | 0 |
Other comprehensive (loss) |  | (2,187) | 1,603 |
Ending Balance |  | 4,198 | 6,385 | 4,782
Tax on other comprehensive income before reclassifications |  | (1,499) | 1,135 |
Tax on amounts reclassified from accumulated other comprehensive income |  | 0 | 0 |
Tax on net current-period other comprehensive income (loss) |  | (1,499) | 1,135 |
Net unrealized gain (loss) on derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | 0 | (93) |
Other comprehensive income (loss), before reclassifications, net of tax |  | (17) | (256) |
Amounts reclassified from accumulated other comprehensive income, net of tax | [1] | 17 | 349 |
Other comprehensive (loss) |  | 0 | 93 |
Ending Balance |  | 0 | 0 | (93)
Tax on other comprehensive income before reclassifications |  | (10) | (146) |
Tax on amounts reclassified from accumulated other comprehensive income |  | 10 | 202 |
Tax on net current-period other comprehensive income (loss) |  | 0 | 56 |
Adjustment to postemployment benefit obligation |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | (15,779) | (10,283) |
Other comprehensive income (loss), before reclassifications, net of tax |  | (4,600) | (6,483) |
Amounts reclassified from accumulated other comprehensive income, net of tax | [2] | 1,026 | 987 |
Other comprehensive (loss) |  | (3,574) | (5,496) |
Ending Balance |  | (19,353) | (15,779) | (10,283)
Tax on other comprehensive income before reclassifications |  | (3,164) | (4,362) |
Tax on amounts reclassified from accumulated other comprehensive income |  | 698 | 674 |
Tax on net current-period other comprehensive income (loss) |  | (2,466) | (3,688) |
Total |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  | (9,394) | (5,594) | (1,621)
Other comprehensive income (loss), before reclassifications, net of tax |  | (6,804) | (5,136) |
Amounts reclassified from accumulated other comprehensive income, net of tax |  | 1,043 | 1,336 |
Other comprehensive (loss) |  | (5,761) | (3,800) | (3,973)
Ending Balance |  | (15,155) | (9,394) | $ (5,594)
Tax on other comprehensive income before reclassifications |  | (4,673) | (3,373) |
Tax on amounts reclassified from accumulated other comprehensive income |  | 708 | 876 |
Tax on net current-period other comprehensive income (loss) |  | $ (3,965) | $ (2,497) |
[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 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=66004921&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=66004124&loc=SL7669686-108580 + Details
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