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SUPPLEMENTAL BALANCE SHEET INFORMATION - Fees Invoiced in Advance (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Fees invoiced in advance    
Customer deposits $ 32,409 $ 39,222
Deferred revenue 18,034 29,420
Fees invoiced in advance $ 50,443 $ 68,642