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SUPPLEMENTAL BALANCE SHEET INFORMATION - Trade Receivables (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Trade receivables and contract assets    
Trade receivables $ 74,576 $ 65,867
Unbilled revenue 10,614 14,624
Total 85,190 80,491
Less: Allowance for credit losses (6,445) (6,931)
Trade receivables and contract assets, net of allowances for credit losses $ 78,745 $ 73,560