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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Taxes [Line Items]
Statutory tax rate	21.00%	21.00%	21.00%
Undistributed foreign earnings not provided for taxes	$ 302,000
Net operating loss deferred tax asset, foreign	2,110	$ 6,106
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	8,724	$ 4,730
Possible decrease in unrecognized tax benefits liability	$ 5,385
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Year remaining open to tax examination		2018
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		2016
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Year remaining open to tax examination		2017