Annual report pursuant to Section 13 and 15(d)

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

v3.20.2
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