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, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Balance, beginning		$ 7,793	$ 5,777	$ 7,738	$ 5,847
Changes in estimates		599	1,398	806	1,696
Write-offs		(120)	(16)	(120)	(475)
Other	[1]	286	(33)	134	58
Balance, ending		$ 8,558	$ 7,126	$ 8,558	$ 7,126

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