Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2023	Sep. 30, 2022
Income Taxes [Line Items]
Gross unrecognized tax benefits	$ 10,533	$ 11,938
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	6,781
Possible decrease in unrecognized tax benefits liability	$ 2,522
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Year remaining open to tax examination	2019
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Year remaining open to tax examination	2018
Foreign Jurisdiction [Member]
Income Taxes [Line Items]
Year remaining open to tax examination	2017