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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 (5,411) $ 137 $ 866
Pension Plan      
Net periodic (benefits) costs:      
Interest cost 5,506 7,050 6,814
Expected return on plan assets (9,387) (10,172) (10,213)
Pension termination settlement (4,621) 0 0
Amortization of:      
Actuarial loss 2,087 2,250 3,314
Total net periodic (benefits) costs (6,415) (872) (85)
Supplemental Employee Retirement Plan      
Net periodic (benefits) costs:      
Interest cost 387 504 488
Expected return on plan assets 0 0 0
Pension termination settlement 0 0 0
Amortization of:      
Actuarial loss 617 505 463
Total net periodic (benefits) costs $ 1,004 $ 1,009 $ 951