Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2020
Income Tax Contingency [Line Items]
Blended tax rate				24.50%
Effective tax rate		18.00%	20.00%	7.00%
Retroactive tax benefit	$ 1,700
Valuation allowance related to deferred tax assets		$ 9,027	$ 8,231		$ 500
Tax expense				$ 500
Undistributed earnings of foreign subsidiaries		16,100
Tax credit carryforwards		100
Change in valuation allowance		800
Unrecognized tax benefits, if recognized, would impact the effective tax rate		800	$ 2,100	$ 1,300
Decrease in unrecognized tax benefits is reasonably possible		100
International
Income Tax Contingency [Line Items]
Operating loss carryforwards		800
Operating loss carryforwards, subject to expiration		$ 200