Revenue (Schedule of Uncollectible Amounts And Change in Expected Allowance for Credit Losses for Trade Accounts Receivable and Unbilled Receivables) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Balance, beginning		$ 5,777	$ 4,203	$ 5,847	$ 3,922
Changes in estimates		1,398	6,042	1,696	6,470
Write-offs		(16)	(247)	(475)	(330)
Other	[1]	(33)	49	58	(113)
Balance, ending		$ 7,126	$ 9,949	$ 7,126	$ 9,949

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