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Debt - Credit Agreement - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Jan. 31, 2023
Debt Instrument [Line Items]
Amount borrowed from credit facility foreign subsidiary	$ 46.3		$ 46.3
Interest expense	$ 15.8	$ 18.4	$ 48.4	$ 60.1
Interest rate during period	4.60%	5.00%	4.70%	4.90%
Line of Credit
Debt Instrument [Line Items]
Unused commitments under revolving credit facility	$ 774.9		$ 774.9
Amounts available for borrowing	$ 757.5		$ 757.5
Line of Credit \| Minimum
Debt Instrument [Line Items]
Credit facility commitment fees percentage			0.175%
Line of Credit \| Maximum
Debt Instrument [Line Items]
Credit facility commitment fees percentage			0.325%
Secured Debt
Debt Instrument [Line Items]
Credit facility amount					$ 500.0
Annual rate for borrowings outstanding	5.00%		5.00%
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility amount					$ 1,250.0