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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended				33 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Jun. 30, 2019	Dec. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2020
Income Taxes [Line Items]
Statutory tax rate	21.00%	35.00%			21.00%	21.00%	24.50%	35.00%	21.00%
Net discrete impacts of the enactment of the Tax Act			$ 10,588	$ 14,778			$ 10,860
Undistributed foreign earnings not provided for taxes					$ 296,165				$ 296,165
Net operating loss deferred tax asset, foreign					6,106	$ 6,836			6,106
Unrecognized tax benefits that, if recognized, would affect the effective tax rate					4,730	4,411			4,730
Accrued interest and penalties					489	$ 437			489
Possible decrease in unrecognized tax benefits liability					$ 84				$ 84
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Years remaining open to tax examination					2018
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Years remaining open to tax examination					2017
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Years remaining open to tax examination					2016
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Years remaining open to tax examination					2016

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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 CCYY format.

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