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COMMON STOCK EQUITY - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | $ 1,236,643 |
Other comprehensive income (loss), before reclassifications, net of tax | (2,290) | $ 7,042
Amounts reclassified from accumulated other comprehensive income, net of tax | (2,914) | (1,210)
Other comprehensive (loss) income | (5,204) | 5,832
Balance as of end of period | 1,347,770 |
Available for Sale Securities |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | 11,044 | 4,198
Other comprehensive income (loss), before reclassifications, net of tax | (2,290) | 7,042
Amounts reclassified from accumulated other comprehensive income, net of tax | (3,154) | (1,527)
Other comprehensive (loss) income | (5,444) | 5,515
Balance as of end of period | 5,600 | 9,713
Tax on other comprehensive income (loss) before reclassifications | (851) | 4,840
Tax on amounts reclassified from accumulated other comprehensive income | (2,178) | (1,054)
Tax on net current-period other comprehensive income (loss) | (3,029) | 3,786
Postemployment Benefit Obligation |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | (14,300) | (19,353)
Other comprehensive income (loss), before reclassifications, net of tax | 0 | 0
Amounts reclassified from accumulated other comprehensive income, net of tax | 240 | 317
Other comprehensive (loss) income | 240 | 317
Balance as of end of period | (14,060) | (19,036)
Tax on other comprehensive income (loss) before reclassifications | 0 | 0
Tax on amounts reclassified from accumulated other comprehensive income | 136 | 217
Tax on net current-period other comprehensive income (loss) | 136 | 217
Total |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance as of beginning of period | (3,256) | (15,155)
Balance as of end of period | (8,460) | (9,323)
Tax on other comprehensive income (loss) before reclassifications | (851) | 4,840
Tax on amounts reclassified from accumulated other comprehensive income | (2,042) | (837)
Tax on net current-period other comprehensive income (loss) | $ (2,893) | $ 4,003

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + 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=84158357&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=84228862&loc=SL7669686-108580 + Details
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