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

PENSION AND OTHER POSTRETIREMENT PLANS - Weighted-Average Assumptions for Principal Retirement and Other Postretirement Benefit Plans (Details)

v3.25.3
PENSION AND OTHER POSTRETIREMENT PLANS - Weighted-Average Assumptions for Principal Retirement and Other Postretirement Benefit Plans (Details)
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.04% 3.51% 4.13%
Other Postretirement      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 5.39% 4.99% 5.86%