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Income Taxes (Unrecognized Tax Benefits, Additional Information) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 2,700
Unrecognized tax benefits	2,908	$ 2,600	$ 1,713	$ 1,561
Accrued income tax penalties and interest for unrecognized tax benefits	100	$ 100
Noncurrent income taxes payable
Income Tax Contingency [Line Items]
Unrecognized tax benefits	2,300
Noncurrent deferred tax assets
Income Tax Contingency [Line Items]
Unrecognized tax benefits	600
Maximum
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits that is reasonably possible	$ 800

X

- Definition

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

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-Publisher FASB
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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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