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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 |

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