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EMPLOYEE BENEFIT PLANS - COMPONENTS OF NET PERIODIC COST (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 1,381 $ 1,244 $ 4,142 $ 3,732
Interest cost 3,858 4,060 11,575 12,180
Expected return on plan assets (5,925) (5,087) (17,775) (15,260)
Recognized actuarial loss 301 29 902 88
Prior service cost (credit) amortization 0 16 0 47
Net periodic benefit (credit) cost (385) 262 (1,156) 787
OPEB        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 273 254 819 1,151
Interest cost 2,096 1,809 6,290 6,519
Expected return on plan assets (2,346) (2,021) (7,039) (5,899)
Recognized actuarial loss 1,792 1,256 5,378 3,007
Prior service cost (credit) amortization (3,270) (3,339) (9,810) (6,676)
Net periodic benefit (credit) cost $ (1,455) $ (2,041) $ (4,362) $ (1,898)