Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 1,123	$ 1,050	$ 1,075	$ 0
Income Tax Examination, Penalties and Interest Accrued	$ (238)	(143)	(95)
Federal statutory income tax rate, percent	21.00%
Income tax expense	$ (10,080)	(7,371)	(9,587)
Undistributed earnings of foreign subsidiaries	77,709	53,766	49,480
Net operating loss carryforwards	48,605	29,407
Domestic Tax Authority
Income Tax Contingency [Line Items]
Operating loss carryforwards	190,386
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Operating loss carryforwards	106,687
Foreign Tax Authority
Income Tax Contingency [Line Items]
Operating loss carryforwards	2,558
Foreign Tax Authority with Indefinite Expiration
Income Tax Contingency [Line Items]
Operating loss carryforwards	8,107
Other Current Liabilities
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 1,599	$ 1,288	$ 1,170