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Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Contract With Customer Asset [Line Items] |  |
Total billed receivables | $ 477,321 | $ 457,234
Current unbilled receivables (contract assets) | 363,520 | 320,570
Total accounts receivable | 840,841 | 777,804
Less: Allowance for uncollectible amounts | (9,725) | (7,738)
Total accounts receivable, net | 831,116 | 770,066
Trade Accounts Receivable [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables | 477,217 | 455,831
Other (Chinese Financial Institutions) [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables | $ 104 | $ 1,403

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