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		9 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue From Contract With Customer [Abstract]
Balance, beginning		$ 9,949	$ 3,141	$ 3,922	$ 3,664
Changes in estimates		77	356	6,463	783
Write-offs		(1,271)		(1,601)	(43)
Other	[1]	(55)	(454)	(84)	(1,361)
Balance, ending		$ 8,700	$ 3,043	$ 8,700	$ 3,043

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