v3.26.1
EMPLOYEE BENEFIT PLANS - Schedule of net periodic costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Net periodic (benefits) costs:      
Pension termination settlement $ (4,621)    
Amortization of:      
Total net periodic (benefits) costs (3,848) $ 662 $ 875
Pension Plan      
Net periodic (benefits) costs:      
Interest cost 263 883 867
Expected return on plan assets (390) (1,160) (906)
Pension termination settlement (4,621) 0 0
Amortization of:      
Actuarial (gain) loss (79) (41) 0
Total net periodic (benefits) costs (4,827) (318) (39)
Supplemental Employee Retirement Plan      
Net periodic (benefits) costs:      
Interest cost 362 475 454
Expected return on plan assets 0 0 0
Pension termination settlement 0 0 0
Amortization of:      
Actuarial (gain) loss 617 505 460
Total net periodic (benefits) costs $ 979 $ 980 $ 914