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Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Contract With Customer Asset [Line Items]
Total billed receivables	$ 321,269	$ 322,119
Current unbilled receivables (contract assets)	269,320	204,596
Total accounts receivable	590,589	526,715
Less: Allowance for uncollectible amounts	(3,043)	(3,664)
Total accounts receivable, net	587,546	523,051
Trade Accounts Receivable [Member]
Contract With Customer Asset [Line Items]
Billed receivables	318,227	298,951
Other (Chinese Financial Institutions) [Member]
Contract With Customer Asset [Line Items]
Billed receivables	$ 3,042	$ 23,168

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