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EMPLOYEE BENEFIT PLANS - Schedule of Weighted-average assumptions used in determining the net periodic benefit costs (Details)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.69% 5.61% 5.52%
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.76% 5.63% 5.17%
Expected return on assets 6.75% 6.75% 6.72%
Supplemental Employee Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.46% 5.53% 5.02%
Expected return on assets 0.00% 0.00% 0.00%