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POST EMPLOYMENT BENEFITS - Discount rate and Rate of compensation increases (Details)
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Retirement Benefits [Abstract]      
Percentage of long-term rate of return assumption 5.10%    
Discount rate 5.87% 5.04% 5.67%
Rate of compensation increases 0.00% 0.00% 0.00%