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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Income Tax Contingency [Line Items]
Effective tax rate		42.00%	18.00%	20.00%
Valuation allowance related to deferred tax assets		$ 10,498	$ 9,027
Retroactive tax benefit	$ 1,700
Undistributed earnings of foreign subsidiaries		11,900
Tax credit carryforwards		100
Increase in valuation allowance		1,500
Unrecognized tax benefits, if recognized, would impact the effective tax rate		1,100	$ 800	$ 2,100
Decrease in unrecognized tax benefits is reasonably possible		300
International
Income Tax Contingency [Line Items]
Valuation allowance related to deferred tax assets		100			$ 500
Operating loss carryforwards		$ 500