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SUPPLEMENTAL BALANCE SHEET INFORMATION - Accrued Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2025
Sep. 30, 2024
Accrued Liabilities and Other Liabilities [Abstract]    
Accrued compensation $ 8,802 $ 10,851
Non-income taxes 3,731 4,409
Accrued interest 3,531 3,017
Current portion of long-term finance lease 426 211
Other 5,124 4,730
Accrued expenses and other current liabilities 35,921 28,218
US DOJ Resolution and Plea Agreements    
Accrued Liabilities and Other Liabilities [Abstract]    
Agreement in Principle 5,000 5,000
Amount paid 5,000 6,500
Loss contingency, estimate of possible loss 17,000  
Securities Class Action Lawsuit    
Accrued Liabilities and Other Liabilities [Abstract]    
Agreement in Principle 9,307 $ 0
Liability recorded related to lawsuits 10,000  
Securities Class Action Lawsuit | Accounts Payable    
Accrued Liabilities and Other Liabilities [Abstract]    
Agreement in Principle $ 693