Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Contract With Customer Asset [Line Items] | ||
| Total billed receivables | $ 617,905 | $ 477,321 |
| Current unbilled receivables (contract assets) | 409,588 | 363,520 |
| Total accounts receivable | 1,027,493 | 840,841 |
| Less: Allowance for uncollectible amounts | (15,012) | (9,725) |
| Total accounts receivable, net | 1,012,481 | 831,116 |
| Trade Accounts Receivable [Member] | ||
| Contract With Customer Asset [Line Items] | ||
| Billed receivables | $ 617,905 | 477,217 |
| Other (Chinese Financial Institutions) [Member] | ||
| Contract With Customer Asset [Line Items] | ||
| Billed receivables | $ 104 |
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- Definition Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Accounts and other receivables gross current. No definition available.
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- Definition Contract With Customer Asset [Line Items] No definition available.
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