Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2025	Sep. 30, 2024
Income Taxes [Line Items]
Gross unrecognized tax benefits	$ 17,054	$ 14,273
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	9,185
Possible decrease in unrecognized tax benefits liability	$ 1,909
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Year remaining open to tax examination	2021
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	2018