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REVENUE FROM CONTRACTS WITH CLIENTS (Tables)
 12 Months Ended
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]  
Schedule of Contract Assets and Liabilities
The following table provides information about contract assets (trade receivables and unbilled revenue, excluding allowances for credit losses), and fees invoiced in advance (client deposits and deferred revenue):
Balance at
September 30,
2023		Balance at
September 30,
2022
Contract Assets: Trade receivables$77,618 $88,867 
Contract Assets: Unbilled revenue17,211 17,474 
Contract liabilities: Client deposits36,689 39,222 
Contract liabilities: Deferred revenue18,933 29,420 
Trade receivables and contract assets, net consisted of the following:
September 30,
2023		September 30,
2022
Trade receivables$77,618 $88,867 
Unbilled revenue17,211 17,474 
Total94,829 106,341 
Less: Allowance for credit losses(7,446)(6,268)
Trade receivables and contract assets, net of allowances for credit losses$87,383 $100,073 
The composition of fees invoiced in advance is as follows:
 September 30, 2023September 30, 2022
Client deposits$36,689 $39,222 
Deferred revenue18,933 29,420 
Fees invoiced in advance$55,622 $68,642 
Schedule of Activity in Allowance for Credit Losses A summary of activity in our allowance for credit losses is as follows:
Fiscal Years Ended
September 30,
20232022
Opening balance$6,268 $668 
Acquired— 4,406 
Charged to expense1,271 1,220 
Uncollectible invoices written off(107)(26)
Amounts collected14 — 
Ending balance$7,446 $6,268