Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT PLANS - Narrative (Details)

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PENSION AND OTHER POSTRETIREMENT PLANS - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]          
Non-cash charge (in excess of)     $ 0 $ (24,242) $ (35,706)
Contribution plan expense     13,032 13,297 12,442
DB Plan          
Defined Benefit Plan Disclosure [Line Items]          
Employer contributions   $ 35,706      
Benefit payments   185,958      
Settlement   $ 56,274      
Non-cash charge (in excess of)         30,856
SERP, DB, and ORRP Plan          
Defined Benefit Plan Disclosure [Line Items]          
Benefit payments $ 24,242        
Non-cash charge (in excess of)       1,271  
Pension          
Defined Benefit Plan Disclosure [Line Items]          
Employer contributions     584 24,840  
Benefit payments     584 598  
Settlement     0 24,242  
Non-cash charge (in excess of)     0 1,271 30,856
Accumulated benefit obligation     14,712 12,896  
Other Postretirement          
Defined Benefit Plan Disclosure [Line Items]          
Employer contributions     513 517  
Benefit payments     513 517  
Settlement     0 0  
Non-cash charge (in excess of)     $ 0 0 $ 0
Per capita cost of health care benefits assumed for next fiscal year (as a percent)     7.00%    
Ultimate health care cost trend rate (as a percent)     4.00%    
Nonqualified Plan          
Defined Benefit Plan Disclosure [Line Items]          
Contribution plan expense     $ 700 $ 1,385