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SUPPLEMENTAL BALANCE SHEET INFORMATION - Fees Invoiced in Advance (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Fees invoiced in advance    
Client deposits $ 24,044 $ 24,898
Deferred revenue 16,419 17,088
Fees invoiced in advance $ 40,463 $ 41,986