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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning Balance | $ 1,166,591 | $ 1,106,956
Other comprehensive (loss), before reclassifications, net of tax | 13,802 | (6,804)
Amounts reclassified from accumulated other comprehensive income, net of tax | (1,903) | 1,043
Net current-period other comprehensive (loss), net of tax | 11,899 | (5,761)
Ending Balance | 1,236,643 | 1,166,591
Unrealized gain (loss) on available for sale securities |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning Balance | 4,198 | 6,385
Other comprehensive (loss), before reclassifications, net of tax | 10,019 | (2,187)
Amounts reclassified from accumulated other comprehensive income, net of tax | (3,173) | 0
Net current-period other comprehensive (loss), net of tax | 6,846 | (2,187)
Ending Balance | 11,044 | 4,198
Tax on other comprehensive income before reclassifications | 6,593 | (1,499)
Tax on amounts reclassified from accumulated other comprehensive income | (2,192) | 0
Tax on net current-period other comprehensive income (loss) | 4,401 | (1,499)
Net unrealized gain (loss) on derivatives |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning Balance | 0 | 0
Other comprehensive (loss), before reclassifications, net of tax | 0 | (17)
Amounts reclassified from accumulated other comprehensive income, net of tax | 0 | 17
Net current-period other comprehensive (loss), net of tax | 0 | 0
Ending Balance | 0 | 0
Tax on other comprehensive income before reclassifications | 0 | (10)
Tax on amounts reclassified from accumulated other comprehensive income | 0 | 10
Tax on net current-period other comprehensive income (loss) | 0 | 0
Adjustment to postemployment benefit obligation |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning Balance | (19,353) | (15,779)
Other comprehensive (loss), before reclassifications, net of tax | 3,783 | (4,600)
Amounts reclassified from accumulated other comprehensive income, net of tax | 1,270 | 1,026
Net current-period other comprehensive (loss), net of tax | 5,053 | (3,574)
Ending Balance | (14,300) | (19,353)
Tax on other comprehensive income before reclassifications | 2,619 | (3,164)
Tax on amounts reclassified from accumulated other comprehensive income | 868 | 698
Tax on net current-period other comprehensive income (loss) | 3,487 | (2,466)
Total |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning Balance | (15,155) | (9,394)
Ending Balance | (3,256) | (15,155)
Tax on other comprehensive income before reclassifications | 9,212 | (4,673)
Tax on amounts reclassified from accumulated other comprehensive income | (1,324) | 708
Tax on net current-period other comprehensive income (loss) | $ 7,888 | $ (3,965)

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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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