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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended			21 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2022
Income Taxes [Line Items]
Statutory tax rate	21.00%	21.00%	21.00%	21.00%
Net operating loss deferred tax asset, foreign	$ 3,449	$ 2,110		$ 3,449
Tax credits and incentives	25,623	22,756		25,623
Undistributed foreign earnings not provided for taxes	346,000			346,000
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	8,092	$ 8,724		8,092
Possible decrease in unrecognized tax benefits liability	$ 4,203			$ 4,203
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Year remaining open to tax examination			2019
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Year remaining open to tax examination			2017
Foreign Jurisdiction [Member]
Income Taxes [Line Items]
Year remaining open to tax examination			2017
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Year remaining open to tax examination			2018

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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