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SUPPLEMENTAL BALANCE SHEET INFORMATION - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Prepaid Expense and Other Assets, Current [Abstract]    
Advances to suppliers $ 23,828 $ 30,292
Prepaid research models 2,906 3,575
Income tax receivable 1,935 366
Other 6,850 8,250
Prepaid expenses and other current assets $ 35,519 $ 42,483