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GOODWILL AND INTANGIBLE ASSETS - Amortization of intangible assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Finite-Lived intangible assets      
Amortization $ 8,781 $ 3,396  
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows      
Totals 338,456   $ 345,886
Customer relationships      
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows      
Totals 286,134   291,906
Intellectual property      
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows      
Totals 49,714   51,230
Non-compete agreements      
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows      
Totals 1,424   1,538
Other      
Estimated amortization expense for intangible assets for each of the next five fiscal years is expected to be as follows      
Totals $ 1,184   $ 1,212