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COMMON STOCK EQUITY - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
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 | $ (2,364) | $ (3,622) | (25,055) | $ 6,474
Amounts reclassified from accumulated other comprehensive income, net of tax | 272 | 318 | 12,431 | (2,220)
Other comprehensive (loss) income | (2,092) | (3,304) | (12,624) | 4,254
Balance as of end of period | 1,449,962 |  | 1,449,962 |
Available for Sale Securities |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | 0 | 11,121 | 11,044 | 4,198
Other comprehensive income (loss), before reclassifications, net of tax | (2,364) | (3,622) | (25,055) | 6,474
Amounts reclassified from accumulated other comprehensive income, net of tax | 0 | 0 | 11,647 | (3,173)
Other comprehensive (loss) income | (2,364) | (3,622) | (13,408) | 3,301
Balance as of end of period | (2,364) | 7,499 | (2,364) | 7,499
Tax on other comprehensive income (loss) before reclassifications | (854) | (2,375) | (9,071) | 4,273
Tax on amounts reclassified from accumulated other comprehensive income | 0 | 0 | 858 | (2,192)
Tax on net current-period other comprehensive income (loss) | (854) | (2,375) | (8,213) | 2,081
Postemployment Benefit Obligation |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (13,788) | (18,718) | (14,300) | (19,353)
Other comprehensive income (loss), before reclassifications, net of tax | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive income, net of tax | 272 | 318 | 784 | 953
Other comprehensive (loss) income | 272 | 318 | 784 | 953
Balance as of end of period | (13,516) | (18,400) | (13,516) | (18,400)
Tax on other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Tax on amounts reclassified from accumulated other comprehensive income | 104 | 217 | 344 | 651
Tax on net current-period other comprehensive income (loss) | 104 | 217 | 344 | 651
Total |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance as of beginning of period | (13,788) | (7,597) | (3,256) | (15,155)
Balance as of end of period | (15,880) | (10,901) | (15,880) | (10,901)
Tax on other comprehensive income (loss) before reclassifications | (854) | (2,375) | (9,071) | 4,273
Tax on amounts reclassified from accumulated other comprehensive income | 104 | 217 | 1,202 | (1,541)
Tax on net current-period other comprehensive income (loss) | $ (750) | $ (2,158) | $ (7,869) | $ 2,732

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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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