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Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Sep. 30, 2020
Contract With Customer Asset [Line Items]
Total billed receivables	$ 377,980	$ 364,554
Current unbilled receivables (contract assets)	217,606	181,792
Total accounts receivable	595,586	546,346
Less: Allowance for uncollectible amounts	(7,522)	(8,359)
Total accounts receivable, net	588,064	537,987
Trade Accounts Receivable [Member]
Contract With Customer Asset [Line Items]
Billed receivables	304,682	307,914
Other (Chinese Financial Institutions) [Member]
Contract With Customer Asset [Line Items]
Billed receivables	$ 73,298	$ 56,640

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