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EMPLOYEE BENEFIT PLANS - ADDITIONAL INFORMATION (Details) - USD ($)
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Employer contributions $ 0 $ 0
Net periodic postretirement benefit costs 262,000 251,000
OPEB    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation, amount 82,000,000  
Net periodic postretirement benefit costs 2,182,000 $ 1,224,000
OPEB | Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Net periodic postretirement benefit costs 11,000,000  
OPEB | Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Net periodic postretirement benefit costs $ 13,000,000