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GOODWILL AND INTANGIBLE ASSETS - Amortization of intangible assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows    
2026 $ 34,686  
2027 34,258  
2028 34,109  
2029 32,972  
2030 28,475  
Thereafter 75,697  
Totals 240,197 $ 274,396
Customer relationships    
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows    
2026 27,847  
2027 27,662  
2028 27,528  
2029 26,391  
2030 23,599  
Thereafter 74,693  
Totals $ 207,720 234,989
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) 8 years  
Intellectual property    
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows    
2026 $ 6,472  
2027 6,472  
2028 6,472  
2029 6,472  
2030 4,767  
Thereafter 664  
Totals $ 31,319 37,724
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) 4 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    
2026 $ 367  
2027 124  
2028 109  
2029 109  
2030 109  
Thereafter 340  
Totals $ 1,158 $ 1,683
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