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, 2024	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Balance, beginning		$ 5,847	$ 3,922	$ 3,664
Changes in estimates		3,219	7,211	447
Write-offs		(586)	(5,305)	(46)
Other	[1]	(742)	19	(143)
Balance, ending		$ 7,738	$ 5,847	$ 3,922

[1] Includes effects of foreign exchange rate changes during the period.