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, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Revenue From Contract With Customer [Abstract]
Balance, beginning		$ 4,203	$ 3,309	$ 3,922	$ 3,664
Changes in estimates		6,042	192	6,470	427
Write-offs		(247)	(26)	(330)	(43)
Other	[1]	(49)	(334)	(113)	(907)
Balance, ending		$ 9,949	$ 3,141	$ 9,949	$ 3,141

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