Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Operating Loss Carryforwards [Line Items]
Accrued GILTI taxes payable	$ 0.5
Decrease to the valuation allowance	0.5
Undistributed losses of foreign subsidiaries	133.6
Undistributed earnings of foreign subsidiaries, estimated taxes recognized upon distribution	6.7
Undistributed foreign earnings	20.0
Liability	1.0
Amount of foreign uncertain tax positions to expire within twelve months	0.4
Income tax penalties and interest expense (benefit)	0.8	$ 0.5	$ (0.2)
Reversal of previously accrued interest and penalties	0.3
Accrued interest and penalties	1.2	$ 0.8	$ 0.7
Domestic Tax Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	3.4
Foreign Tax Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	46.2
Tax credit carryforward	$ 0.9