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EMPLOYEE BENEFIT PLANS - COMPONENTS OF NET PERIODIC COST (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 1,244 $ 1,350 $ 3,732 $ 4,051
Interest cost 4,060 3,794 12,180 11,381
Expected return on plan assets (5,087) (4,993) (15,260) (14,979)
Recognized actuarial loss 29 75 88 225
Prior service cost (credit) amortization 16 25 47 76
Net periodic benefit cost (credit) 262 251 787 754
OPEB        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 254 618 1,151 1,854
Interest cost 1,809 2,286 6,519 6,859
Expected return on plan assets (2,021) (1,680) (5,899) (5,041)
Recognized actuarial loss 1,256 0 3,007 0
Prior service cost (credit) amortization (3,339) 0 (6,676) 0
Net periodic benefit cost (credit) $ (2,041) $ 1,224 $ (1,898) $ 3,672