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DEBT - Aggregate Maturities of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Debt Disclosure [Abstract]    
2022 $ 0  
2023 0  
2024 0  
2025 0  
2026 0  
Thereafter - Due 2031 550,000  
Long-term debt $ 550,000 $ 487,148