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Revenue (Schedule of Uncollectible Amounts And Change in Expected Allowance for Credit Losses for Trade Accounts Receivable and Unbilled Receivables) (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Balance, beginning		$ 7,738	$ 5,847	$ 3,922
Changes in estimates		1,879	3,219	7,211
Write-offs		(347)	(586)	(5,305)
Other	[1]	455	(742)	19
Balance, ending		$ 9,725	$ 7,738	$ 5,847
[1] Includes effects of foreign exchange rate changes during the period.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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