Annual report pursuant to Section 13 and 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME - Change in AOCI by Component, Net of Tax (Details)

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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, 2024
Sep. 30, 2023
Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance $ 525,281 $ 487,076 $ 636,403
Net current-period OCI 5,685 15,798 2,562
Ending Balance 437,206 525,281 487,076
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (174,404) (190,191) (192,739)
OCI before reclassification 9,123 18,511 (20,818)
Amounts reclassified from AOCI (3,461) (2,724) 23,366
Net current-period OCI 5,662 15,787 2,548
Ending Balance (168,742) (174,404) (190,191)
Postretirement Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance 6,760 5,182 (35,930)
OCI before reclassification (955) 1,476 17,851
Amounts reclassified from AOCI (850) 102 23,261
Net current-period OCI (1,805) 1,578 41,112
Ending Balance 4,955 6,760 5,182
Currency Translation Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (190,196) (203,310) (155,251)
OCI before reclassification 16,182 13,979 (46,817)
Amounts reclassified from AOCI (609) (865) (1,242)
Net current-period OCI 15,573 13,114 (48,059)
Ending Balance (174,623) (190,196) (203,310)
Cash Flow Hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance 9,032 7,937 (1,558)
OCI before reclassification (6,104) 3,056 8,148
Amounts reclassified from AOCI (2,002) (1,961) 1,347
Net current-period OCI (8,106) 1,095 9,495
Ending Balance 926 9,032 7,937
Noncontrolling Interest      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance 266 255 241
OCI before reclassification 23 11 14
Net current-period OCI 23 11 14
Ending Balance 289 266 255
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 266 255 241
OCI before reclassification 23 11 14
Net current-period OCI 23 11 14
Ending Balance 289 266 255
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