Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Contingency [Line Items]
Effective tax rate	23.00%	24.00%	21.00%
Credit carryforwards	$ 797	$ 1,304
Income tax benefit	(52,803)	(46,240)	$ (14,425)
Undistributed earnings of foreign subsidiaries	53,700
Increase in valuation allowance (less than)	100
Unrecognized tax benefits, if recognized, would impact the effective tax rate	1,900	1,500	$ 1,600
Decrease in unrecognized tax benefits is reasonably possible	300
International
Income Tax Contingency [Line Items]
Operating loss carryforwards	$ 200
Canada \| International
Income Tax Contingency [Line Items]
Credit carryforwards		500
Income tax benefit		$ 500

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

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