Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT PLANS - Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Details)

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PENSION AND OTHER POSTRETIREMENT PLANS - Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Pension      
Change in benefit obligation:      
Benefit obligation, beginning of year $ 12,896 $ 36,609  
Service cost 125 163 $ 392
Interest cost 530 497 1,127
Actuarial loss (gain) 1,100 (512)  
Settlement 0 (24,242)  
Exchange loss 645 979  
Benefit payments (584) (598)  
Benefit obligation, end of year 14,712 12,896 36,609
Change in plan assets:      
Fair value, beginning of year 0 0  
Benefit payments (584) (598)  
Employer contributions 584 24,840  
Settlement 0 (24,242)  
Fair value, end of year 0 0 0
Funded status (14,712) (12,896)  
Amounts recognized in the consolidated balance sheet:      
Current liability 0 (68)  
Noncurrent benefit liability (14,712) (12,828)  
Accumulated other comprehensive income (1,453) (1,518)  
Net amount recognized (16,165) (14,414)  
Amounts recognized in accumulated        other comprehensive (income) loss      
Actuarial gain (1,453) (1,518)  
Prior service credit 0 0  
Other Postretirement      
Change in benefit obligation:      
Benefit obligation, beginning of year 12,375 12,813  
Service cost 55 76 165
Interest cost 684 644 411
Actuarial loss (gain) 777 (641)  
Settlement 0 0  
Exchange loss 0 0  
Benefit payments (513) (517)  
Benefit obligation, end of year 13,378 12,375 12,813
Change in plan assets:      
Fair value, beginning of year 0 0  
Benefit payments (513) (517)  
Employer contributions 513 517  
Settlement 0 0  
Fair value, end of year 0 0 $ 0
Funded status (13,378) (12,375)  
Amounts recognized in the consolidated balance sheet:      
Current liability (872) (876)  
Noncurrent benefit liability (12,506) (11,499)  
Accumulated other comprehensive income (4,998) (6,862)  
Net amount recognized (18,376) (19,237)  
Amounts recognized in accumulated        other comprehensive (income) loss      
Actuarial gain (4,407) (5,906)  
Prior service credit $ (591) $ (956)