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INTANGIBLE ASSETS - Intangible Assets, net by major class (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Finite-Lived intangible assets    
Carrying Amount, Gross $ 378,225 $ 377,994
Accumulated Amortization (95,685) (69,566)
Carrying Amount, Net 282,540 308,428
Client relationships    
Finite-Lived intangible assets    
Carrying Amount, Gross 317,026 316,820
Accumulated Amortization (75,585) (54,711)
Carrying Amount, Net 241,441 262,109
Intellectual property    
Finite-Lived intangible assets    
Carrying Amount, Gross 56,362 56,337
Accumulated Amortization (17,077) (12,234)
Carrying Amount, Net 39,285 44,103
Other    
Finite-Lived intangible assets    
Carrying Amount, Gross 4,837 4,837
Accumulated Amortization (3,023) (2,621)
Carrying Amount, Net $ 1,814 $ 2,216