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, 2023
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]          
Non-cash charge (in excess of)     $ (24,242) $ (35,706) $ 0
Contribution plan expense     13,297 12,442 9,186
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     24,840 36,882  
Benefit payments     598 3,362  
Settlement     24,242 242,232  
Non-cash charge (in excess of)     1,271 30,856 0
Accumulated benefit obligation     12,896 36,609  
Projected benefit obligation     12,896 36,609  
Other Postretirement          
Defined Benefit Plan Disclosure [Line Items]          
Employer contributions     517 615  
Benefit payments     517 615  
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     $ 1,385