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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2020
Income Taxes [Line Items]
Statutory tax rate	21.00%	21.00%	21.00%
Net operating loss deferred tax asset, foreign	$ 6,547	$ 3,748
Tax credits and incentives	30,886	28,319
Undistributed foreign earnings not provided for taxes	361,600
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	8,003	$ 6,963
Possible decrease in unrecognized tax benefits liability	1,909
Booking of associated net deferred tax liability	$ 6,100
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Year remaining open to tax examination				2021
Foreign Jurisdiction [Member]
Income Taxes [Line Items]
Year remaining open to tax examination				2018
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Year remaining open to tax examination				2018