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Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Sep. 30, 2025
--- | --- | ---
Contract With Customer Asset [Line Items] |  |
Total billed receivables | $ 536,474 | $ 477,321
Current unbilled receivables (contract assets) | 407,864 | 363,520
Total accounts receivable | 944,338 | 840,841
Less: Allowance for uncollectible amounts | (13,107) | (9,725)
Total accounts receivable, net | 931,231 | 831,116
Trade Accounts Receivable [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables | $ 536,474 | 477,217
Other (Chinese Financial Institutions) [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables |  | $ 104

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