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SUPPLEMENTAL BALANCE SHEET INFORMATION - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Prepaid Expense and Other Assets, Current [Abstract]    
Advances to suppliers $ 27,761 $ 36,516
Prepaid research models 4,526 4,993
Income tax receivable 2,079 2,602
Note receivable 1,335 1,280
Other 6,295 4,857
Prepaid expenses and other current assets $ 41,996 $ 50,248