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POST EMPLOYMENT BENEFITS - Major assumptions used in determining the net periodic benefit costs (Details)
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Retirement Benefits [Abstract]      
Amortization period of actuarial gains (losses) greater than 10% 10 years    
Discount rate 5.04% 5.67% 5.33%
Expected return on plan assets 5.20% 4.85% 4.96%