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ACCUMULATED OTHER COMPREHENSIVE INCOME - Change in AOCI by Component, Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 790,259 | $ 709,334 | $ 734,046
Net current-period OCI | (1,298) | 27,872 | (31,631)
Ending Balance | 868,714 | 790,259 | 709,334
Postretirement Benefit Plans |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (43,623) | (56,050) | (43,474)
OCI before reclassification | 10,584 | 6,536 | (16,901)
Amounts reclassified from AOCI | 5,047 | 5,891 | 4,325
Reclassification of AOCI tax effects | (9,884) |  |
Net current-period OCI | 15,631 | 12,427 | (12,576)
Ending Balance | (37,876) | (43,623) | (56,050)
Currency Translation Adjustment |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (112,907) | (122,259) | (104,604)
OCI before reclassification | (22,053) | 9,352 | (17,655)
Amounts reclassified from AOCI | 0 | 0 | 0
Reclassification of AOCI tax effects | 0 |  |
Net current-period OCI | (22,053) | 9,352 | (17,655)
Ending Balance | (134,960) | (112,907) | (122,259)
Derivatives |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 2,415 | (3,559) | (2,248)
OCI before reclassification | 6,095 | 7,043 | (3,230)
Amounts reclassified from AOCI | (1,042) | (1,069) | 1,919
Reclassification of AOCI tax effects | 1,070 |  |
Net current-period OCI | 5,053 | 5,974 | (1,311)
Ending Balance | 8,538 | 2,415 | (3,559)
Total |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (154,115) | (181,868) | (150,326)
OCI before reclassification | (5,374) | 22,931 | (37,786)
Amounts reclassified from AOCI | 4,005 | 4,822 | 6,244
Reclassification of AOCI tax effects | (8,814) |  |
Net current-period OCI | (1,369) | 27,753 | (31,542)
Ending Balance | (164,298) | (154,115) | (181,868)
Postretirement Benefit Plans attributable to Noncontrolling Interest |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 0 | 0 | 0
OCI before reclassification | 0 | 0 | 0
Net current-period OCI | 0 | 0 | 0
Ending Balance | 0 | 0 | 0
Currency Translation Adjustment attributable to Noncontrolling Interest |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 396 | 277 | 366
OCI before reclassification | 71 | 119 | (89)
Net current-period OCI | 71 | 119 | (89)
Ending Balance | 467 | 396 | 277
Derivatives attributable to Noncontrolling Interest |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 0 | 0 | 0
OCI before reclassification | 0 | 0 | 0
Net current-period OCI | 0 | 0 | 0
Ending Balance | 0 | 0 | 0
Noncontrolling Interest |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 277 | 277 | 366
OCI before reclassification | 71 | 119 | (89)
Net current-period OCI | 71 | 119 | (89)
Ending Balance | $ 348 | $ 277 | $ 277

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