Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT PLANS - Net Periodic Pension and Other Postretirement Benefit Cost (Details)

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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, 2024
Sep. 30, 2023
Sep. 30, 2022
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 $ (24,242) $ (35,706)
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 125 163 392
Interest cost 530 497 1,127
Expected return on plan assets 0 0 (1,040)
Prior service cost (credit) 0 0 (152)
Net actuarial (gain) loss (53) (64) 469
Settlement 0 1,271 30,856
Net benefit cost 602 1,867 31,652
Other Postretirement      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 55 76 165
Interest cost 684 644 411
Expected return on plan assets 0 0 0
Prior service cost (credit) (364) (364) (364)
Net actuarial (gain) loss (722) (708) 0
Settlement 0 0 0
Net benefit cost $ (347) $ (352) $ 212