Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2021	Sep. 30, 2021
Income Taxes [Line Items]
Gross unrecognized tax benefits	$ 13,135	$ 15,199
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	8,356
Possible decrease in unrecognized tax benefits liability	$ 4,345
Domestic Tax Authority [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	2017
Foreign Jurisdiction [Member]
Income Taxes [Line Items]
Year remaining open to tax examination	2017

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

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Tax year that remains open to examination under enacted tax laws, in YYYY format.

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Amount of unrecognized tax benefits.

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