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SUPPLEMENTAL BALANCE SHEET INFORMATION - Trade Receivables (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Trade receivables and contract assets    
Trade receivables $ 78,461 $ 22,838
Unbilled revenue 12,693 6,194
Total 91,154 29,032
Less: Allowance for doubtful accounts (4,698) (668)
Trade receivables and contract assets, net of allowances for doubtful accounts $ 86,456 $ 28,364