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COMMON STOCK EQUITY - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | $ 1,166,591 |
Other comprehensive income | 5,832 | $ 3,924
Balance as of end of period | 1,185,361 |
Available for Sale Securities |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | 4,198 | 6,385
Other comprehensive income (loss), before reclassifications, net of tax | 7,042 | 3,701
Amounts reclassified from accumulated other comprehensive income, net of tax | (1,527) | 0
Other comprehensive income | 5,515 | 3,701
Balance as of end of period | 9,713 | 10,086
Tax on other comprehensive income (loss) before reclassifications | 4,840 | 2,614
Tax on amounts reclassified from accumulated other comprehensive income | (1,054) | 0
Tax on net current-period other comprehensive income (loss) | 3,786 | 2,614
Cash Flow Hedges |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | 0 | 0
Other comprehensive income (loss), before reclassifications, net of tax | 0 | (41)
Amounts reclassified from accumulated other comprehensive income, net of tax | 0 | 8
Other comprehensive income | 0 | (33)
Balance as of end of period | 0 | (33)
Tax on other comprehensive income (loss) before reclassifications | 0 | (23)
Tax on amounts reclassified from accumulated other comprehensive income | 0 | 4
Tax on net current-period other comprehensive income (loss) | 0 | (19)
Postemployment Benefit Obligation |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | (19,353) | (15,779)
Other comprehensive income (loss), before reclassifications, net of tax | 0 | 0
Amounts reclassified from accumulated other comprehensive income, net of tax | 317 | 256
Other comprehensive income | 317 | 256
Balance as of end of period | (19,036) | (15,523)
Tax on other comprehensive income (loss) before reclassifications | 0 | 0
Tax on amounts reclassified from accumulated other comprehensive income | 217 | 174
Tax on net current-period other comprehensive income (loss) | 217 | 174
Total |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | (15,155) | (9,394)
Other comprehensive income (loss), before reclassifications, net of tax | 7,042 | 3,660
Amounts reclassified from accumulated other comprehensive income, net of tax | (1,210) | 264
Other comprehensive income | 5,832 | 3,924
Balance as of end of period | (9,323) | (5,470)
Tax on other comprehensive income (loss) before reclassifications | 4,840 | 2,591
Tax on amounts reclassified from accumulated other comprehensive income | (837) | 178
Tax on net current-period other comprehensive income (loss) | $ 4,003 | $ 2,769

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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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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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