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GOODWILL AND INTANGIBLE ASSETS - Amortization of intangible assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows    
2024 $ 34,754  
2025 34,744  
2026 34,525  
2027 34,096  
2028 33,948  
Thereafter 136,361  
Totals $ 308,428 $ 345,886
Weighted Average    
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows    
RUL1 (in years) 9 years 4 months 24 days  
Customer relationships    
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows    
2024 $ 27,774  
2025 27,774  
2026 27,712  
2027 27,526  
2028 27,393  
Thereafter 123,930  
Totals $ 262,109 291,906
Customer relationships | Weighted Average    
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows    
RUL1 (in years) 9 years 10 months 24 days  
Intellectual property    
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows    
2024 $ 6,446  
2025 6,446  
2026 6,446  
2027 6,446  
2028 6,446  
Thereafter 11,873  
Totals $ 44,103 51,230
Intellectual property | Weighted Average    
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows    
RUL1 (in years) 6 years 10 months 24 days  
Other    
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows    
2024 $ 534  
2025 524  
2026 367  
2027 124  
2028 109  
Thereafter 558  
Totals $ 2,216 $ 2,750
Other | Weighted Average    
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows    
RUL1 (in years) 6 years 4 months 24 days