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Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Contract With Customer Asset [Line Items] |  |
Total billed receivables | $ 312,628 | $ 364,554
Current unbilled receivables (contract assets) | 204,592 | 181,792
Less: Allowance for uncollectible amounts | (7,499) | (8,359)
Total accounts receivable, net | 509,721 | 537,987
Trade Accounts Receivable [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables | 265,732 | 307,914
Other (Chinese Financial Institutions) [Member] |  |
Contract With Customer Asset [Line Items] |  |
Billed receivables | $ 46,896 | $ 56,640

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