Annual report pursuant to Section 13 and 15(d)

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

v3.22.2.2
PENSION AND OTHER POSTRETIREMENT PLANS - Net Periodic Pension and Other Postretirement Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
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
Non-cash charge (in excess of) $ 30,856 $ 0 $ 0
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 392 7,919 8,679
Interest cost 1,127 6,145 7,735
Expected return on plan assets (1,040) (10,809) (10,214)
Prior service cost (152) (127) (186)
Net actuarial loss 469 9,769 9,767
Curtailment gain 0 (220) 0
Special termination benefits 0 315 0
Prior-service cost write-off 0 261 0
Non-cash charge (in excess of) 30,856 0 0
Net benefit cost 31,652 13,253 15,781
Other Postretirement      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 165 201 227
Interest cost 411 376 501
Expected return on plan assets 0 0 0
Prior service cost (364) (364) (464)
Net actuarial loss 0 0 0
Curtailment gain 0 0 0
Special termination benefits 0 0 0
Prior-service cost write-off 0 0 0
Non-cash charge (in excess of) 0 0 0
Net benefit cost $ 212 $ 213 $ 264