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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, 2019
Sep. 30, 2018
Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance $ 868,714 $ 790,259 $ 709,334
OCI before reclassification (64,578) (5,374) 22,931
Amounts reclassified from AOCI 515 4,005 4,822
Net current-period OCI (64,063) (1,369) 27,753
Reclassification of AOCI tax effects   (8,814)  
Ending Balance 719,236 868,714 790,259
Postretirement Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (37,876) (43,623) (56,050)
OCI before reclassification (36,784) 10,584 6,536
Amounts reclassified from AOCI 2,917 5,047 5,891
Net current-period OCI (33,867) 15,631 12,427
Reclassification of AOCI tax effects   (9,884)  
Ending Balance (71,743) (37,876) (43,623)
Currency Translation Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (134,960) (112,907) (122,259)
OCI before reclassification (21,254) (22,053) 9,352
Amounts reclassified from AOCI 0 0 0
Net current-period OCI (21,254) (22,053) 9,352
Reclassification of AOCI tax effects   0  
Ending Balance (156,214) (134,960) (112,907)
Derivatives      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance 8,538 2,415 (3,559)
OCI before reclassification (6,540) 6,095 7,043
Amounts reclassified from AOCI (2,402) (1,042) (1,069)
Net current-period OCI (8,942) 5,053 5,974
Reclassification of AOCI tax effects   1,070  
Ending Balance (404) 8,538 2,415
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (164,298) (154,115) (181,868)
Reclassification of AOCI tax effects   (8,814)  
Ending Balance (228,361) (164,298) (154,115)
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 467 396 277
OCI before reclassification (92) 71 119
Net current-period OCI (92) 71 119
Ending Balance 375 467 396
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 467 396 277
OCI before reclassification (92) 71 119
Net current-period OCI (92) 71 119
Ending Balance $ 375 $ 467 $ 396