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Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Contract With Customer Asset [Line Items] |  |
Total billed receivables | $ 446,699 | $ 368,769
Current unbilled receivables (contract assets) | 294,806 | 245,117
Total accounts receivable | 741,505 | 613,886
Less: Allowance for uncollectible amounts | (8,700) | (3,922)
Total accounts receivable, net | 732,805 | 609,964
Trade Accounts Receivable [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables | 408,601 | 359,364
Other (Chinese Financial Institutions) [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables | $ 38,098 | $ 9,405

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