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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2023
Income Taxes [Line Items]
Statutory rates	19.10%	11.80%	18.60%	9.50%
Gross unrecognized tax benefits	$ 12,715		$ 12,715		$ 11,112
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	8,110		8,110
Possible decrease in unrecognized tax benefits liability	$ 2,178		$ 2,178
Minimum [Member]
Income Taxes [Line Items]
Statutory rates	19.00%	19.00%
Maximum [Member]
Income Taxes [Line Items]
Statutory rates	35.00%	35.00%
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Year remaining open to tax examination			2020
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Year remaining open to tax examination			2019
Foreign Jurisdiction [Member]
Income Taxes [Line Items]
Year remaining open to tax examination			2018