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Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Contract With Customer Asset [Line Items] |  |
Total billed receivables | $ 441,964 | $ 485,227
Current unbilled receivables (contract assets) | 325,007 | 270,479
Total accounts receivable | 766,971 | 755,706
Less: Allowance for uncollectible amounts | (6,961) | (5,847)
Total accounts receivable, net | 760,010 | 749,859
Trade Accounts Receivable [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables | 441,007 | 434,287
Other (Chinese Financial Institutions) [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables | $ 957 | $ 50,940

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