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EMPLOYEE BENEFIT PLANS - COMPONENTS OF NET PERIODIC COST (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Pension |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | $ 1,350 | $ 2,073 | $ 4,051 | $ 6,219
Interest cost | 3,794 | 2,408 | 11,381 | 7,224
Expected return on plan assets | (4,993) | (5,319) | (14,979) | (15,956)
Recognized actuarial loss | 75 | 2,186 | 225 | 6,558
Prior service cost (credit) amortization | 25 | 25 | 76 | 76
Net periodic benefit cost | 251 | 1,373 | 754 | 4,121
OPEB |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Service cost | 618 | 1,077 | 1,854 | 3,229
Interest cost | 2,286 | 1,588 | 6,859 | 4,766
Expected return on plan assets | (1,680) | (1,893) | (5,041) | (5,681)
Recognized actuarial loss | 0 | 1,421 | 0 | 4,263
Prior service cost (credit) amortization | 0 | (35) | 0 | (107)
Net periodic benefit cost | $ 1,224 | $ 2,158 | $ 3,672 | $ 6,470

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