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Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Contract With Customer Asset [Line Items] |  |
Less: Allowance for uncollectible amounts | $ (7,180) | $ (7,908)
Net billed receivables | 334,796 | 416,205
Current unbilled receivables (contract assets), net | 202,719 | 175,324
Total accounts receivable, net | 537,515 | 591,529
Trade Accounts Receivable [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables | 294,113 | 381,942
Other (Chinese Financial Institutions) [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables | $ 47,863 | $ 42,171

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