Annual report [Section 13 and 15(d), not S-K Item 405]

PENSION AND OTHER POSTRETIREMENT PLANS - Narrative (Details)

v3.25.3
PENSION AND OTHER POSTRETIREMENT PLANS - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Non-cash charge (in excess of)   $ 0 $ 0 $ (24,242)
Contribution plan expense   11,127 13,032 13,297
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]        
Benefit payments   573 584  
Non-cash charge (in excess of)   0 0 1,271
Accumulated benefit obligation   14,034 14,712  
Other Postretirement        
Defined Benefit Plan Disclosure [Line Items]        
Benefit payments   346 513  
Non-cash charge (in excess of)   $ 0 0 0
Per capita cost of health care benefits assumed for next fiscal year (as a percent)   8.00%    
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