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

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, 2025
Sep. 30, 2024
Sep. 30, 2023
Pension      
Change in benefit obligation:      
Benefit obligation, beginning of year $ 14,712 $ 12,896  
Service cost 142 125 $ 163
Interest cost 493 530 497
Actuarial (gain) loss (1,503) 1,100  
Exchange loss 763 645  
Benefit payments (573) (584)  
Benefit obligation, end of year 14,034 14,712 12,896
Change in plan assets:      
Fair value, beginning of year 0 0  
Benefit payments (573) (584)  
Employer contributions 573 584  
Fair value, end of year 0 0 0
Funded status (14,034) (14,712)  
Amounts recognized in the consolidated balance sheet:      
Current liability 0 0  
Noncurrent benefit liability (14,034) (14,712)  
Accumulated other comprehensive income (2,098) (1,453)  
Net amount recognized (16,132) (16,165)  
Amounts recognized in accumulated        other comprehensive (income) loss      
Actuarial gain (2,098) (1,453)  
Prior service credit 0 0  
Other Postretirement      
Change in benefit obligation:      
Benefit obligation, beginning of year 13,378 12,375  
Service cost 52 55 76
Interest cost 608 684 644
Actuarial (gain) loss (1,675) 777  
Exchange loss 0 0  
Benefit payments (346) (513)  
Benefit obligation, end of year 12,017 13,378 12,375
Change in plan assets:      
Fair value, beginning of year 0 0  
Benefit payments (346) (513)  
Employer contributions 346 513  
Fair value, end of year 0 0 $ 0
Funded status (12,017) (13,378)  
Amounts recognized in the consolidated balance sheet:      
Current liability (779) (872)  
Noncurrent benefit liability (11,238) (12,506)  
Accumulated other comprehensive income (5,803) (4,998)  
Net amount recognized (17,820) (18,376)  
Amounts recognized in accumulated        other comprehensive (income) loss      
Actuarial gain (5,574) (4,407)  
Prior service credit $ (229) $ (591)