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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, 2020 | Sep. 30, 2019 | Sep. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 719,236 | $ 868,714 | $ 790,259
OCI before reclassification | (19,891) | (64,578) | (5,374)
Amounts reclassified from AOCI | 7,533 | 515 | 4,005
Net current-period OCI | (12,358) | (64,063) | (1,369)
Reclassification of AOCI tax effects |  |  | (8,814)
Net current-period OCI | (7) | (92) | 71
Ending Balance | 611,433 | 719,236 | 868,714
Postretirement Benefit Plans |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (71,743) | (37,876) | (43,623)
OCI before reclassification | (18,094) | (36,784) | 10,584
Amounts reclassified from AOCI | 6,883 | 2,917 | 5,047
Net current-period OCI | (11,211) | (33,867) | 15,631
Reclassification of AOCI tax effects |  |  | (9,884)
Ending Balance | (82,954) | (71,743) | (37,876)
Currency Translation Adjustment |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (156,214) | (134,960) | (112,907)
OCI before reclassification | 4,333 | (21,254) | (22,053)
Amounts reclassified from AOCI | 0 | 0 | 0
Net current-period OCI | 4,333 | (21,254) | (22,053)
Reclassification of AOCI tax effects |  |  | 0
Ending Balance | (151,881) | (156,214) | (134,960)
Derivatives |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (404) | 8,538 | 2,415
OCI before reclassification | (6,130) | (6,540) | 6,095
Amounts reclassified from AOCI | 650 | (2,402) | (1,042)
Net current-period OCI | (5,480) | (8,942) | 5,053
Reclassification of AOCI tax effects |  |  | 1,070
Ending Balance | (5,884) | (404) | 8,538
Total |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (228,361) | (164,298) | (154,115)
Reclassification of AOCI tax effects |  |  | (8,814)
Ending Balance | (240,719) | (228,361) | (164,298)
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 | 375 | 467 | 396
OCI before reclassification | (7) | (92) | 71
Net current-period OCI | (7) | (92) | 71
Ending Balance | 368 | 375 | 467
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 | 375 | 467 | 396
OCI before reclassification | (7) | (92) | 71
Net current-period OCI | (7) | (92) | 71
Ending Balance | $ 368 | $ 375 | $ 467

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