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Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Contract With Customer Asset [Line Items]
Total billed receivables	$ 475,315	$ 457,234
Current unbilled receivables (contract assets)	363,242	320,570
Total accounts receivable	838,557	777,804
Less: Allowance for uncollectible amounts	(8,976)	(7,738)
Total accounts receivable, net	829,581	770,066
Trade Accounts Receivable [Member]
Contract With Customer Asset [Line Items]
Billed receivables	475,152	455,831
Other (Chinese Financial Institutions) [Member]
Contract With Customer Asset [Line Items]
Billed receivables	$ 163	$ 1,403

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