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Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Contract With Customer Asset [Line Items]
Less: Allowance for uncollectible amounts	$ (6,889)	$ (7,908)
Net billed receivables	357,665	416,205
Current unbilled receivables (contract assets), net	180,322	175,324
Total accounts receivable, net	537,987	591,529
Trade Accounts Receivable [Member]
Contract With Customer Asset [Line Items]
Billed receivables	307,914	381,942
Other (Chinese Financial Institutions) [Member]
Contract With Customer Asset [Line Items]
Billed receivables	$ 56,640	$ 42,171

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