Annual report [Section 13 and 15(d), not S-K Item 405]

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

v3.25.3
ACCUMULATED OTHER COMPREHENSIVE INCOME - Change in AOCI by Component, Net of Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance $ 437,206 $ 525,281 $ 487,076
Net current-period OCI 90,732 5,685 15,798
Ending Balance 480,942 437,206 525,281
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (168,742) (174,404) (190,191)
OCI before reclassification (6,333) 9,123 18,511
Amounts reclassified from AOCI 97,065 (3,461) (2,724)
Net current-period OCI 90,732 5,662 15,787
Ending Balance (78,010) (168,742) (174,404)
Postretirement Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance 4,955 6,760 5,182
OCI before reclassification 3,267 (955) 1,476
Amounts reclassified from AOCI (682) (850) 102
Net current-period OCI 2,585 (1,805) 1,578
Ending Balance 7,540 4,955 6,760
Currency Translation Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (174,623) (190,196) (203,310)
OCI before reclassification (9,095) 16,182 13,979
Amounts reclassified from AOCI 98,721 (609) (865)
Net current-period OCI 89,626 15,573 13,114
Ending Balance (84,997) (174,623) (190,196)
Cash Flow Hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance 926 9,032 7,937
OCI before reclassification (505) (6,104) 3,056
Amounts reclassified from AOCI (974) (2,002) (1,961)
Net current-period OCI (1,479) (8,106) 1,095
Ending Balance (553) 926 9,032
Noncontrolling Interest      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance 289 266 255
OCI before reclassification 0 23 11
Net current-period OCI 0 23 11
Ending Balance 289 289 266
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 289 266 255
OCI before reclassification 0 23 11
Net current-period OCI 0 23 11
Ending Balance 289 289 266
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