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POST EMPLOYMENT BENEFITS - Pension Funding and Payments and Defined Contribution Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Retirement Benefits [Abstract]    
Employer contributions $ 1,226 $ 1,059
Defined contribution benefit expense 4,596 $ 3,312
Projected Benefit Payments    
2024 786  
2025 661  
2026 787  
2027 985  
2028 827  
Thereafter 4,142  
Total $ 8,188