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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Taxes [Line Items]
Statutory tax rate	21.00%	21.00%	21.00%
Net operating loss deferred tax asset, foreign	$ 2,564	$ 6,547
Tax credits and incentives	32,171	30,886
Undistributed foreign earnings not provided for taxes	327,400
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	8,858	$ 8,003
Possible decrease in unrecognized tax benefits liability	1,076
Booking of associated cumulative net deferred tax liability	$ 6,040
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Year remaining open to tax examination	2022
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

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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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