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SUPPLEMENTAL BALANCE SHEET INFORMATION - Trade Receivables (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Trade receivables and contract assets    
Trade receivables $ 53,737 $ 77,618
Unbilled revenue 15,910 17,211
Total 69,647 94,829
Less: Allowance for credit losses (5,780) (7,446)
Trade receivables and contract assets, net of allowances for credit losses $ 63,867 $ 87,383