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POST EMPLOYMENT BENEFITS - Pension Funding and Payments and Defined Contribution Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Retirement Benefits [Abstract]    
Employer contributions $ 0 $ 1,226
Expected contributions to be made within twelve months 0  
Defined contribution benefit expense 2,807 $ 4,596
Projected Benefit Payments    
2025 726  
2026 863  
2027 1,080  
2028 908  
2029 897  
Thereafter 4,786  
Total $ 9,260