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PENSION AND OTHER POSTRETIREMENT PLANS - Net Periodic Pension and Other Postretirement Benefit Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (deductions), net | Other income (deductions), net | Other income (deductions), net
Settlement | $ 0 | $ 0 | $ (24,242)
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 142 | 125 | 163
Interest cost | 493 | 530 | 497
Prior service cost (credit) | 0 | 0 | 0
Net actuarial (gain) loss | (41) | (53) | (64)
Settlement | 0 | 0 | 1,271
Net benefit cost | 594 | 602 | 1,867
Other Postretirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 52 | 55 | 76
Interest cost | 608 | 684 | 644
Prior service cost (credit) | (362) | (364) | (364)
Net actuarial (gain) loss | (510) | (722) | (708)
Settlement | 0 | 0 | 0
Net benefit cost | $ (212) | $ (347) | $ (352)

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