Pension Plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Weighted average interest credit rate used in only cash balance pension plans		4.30%
Defined benefit plan, plan assets, increase (decrease) for actual return (loss)		$ 5,100	$ (1,900)	$ 2,300
Defined benefit plan, plan assets, contributions by employer		$ 3,700	$ 1,300	$ 3,000
Forecast
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension income	$ 300
Defined benefit plan, plan assets, contributions by employer	600
Defined benefit plan, plan assets, contributions by employer, directly to plans	$ 3,300
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Weighted average assumptions used to determine net periodic pension cost for fiscal years ended September 30, Rate of return on plan assets		4.80%	4.80%	5.00%
Net periodic pension income		$ 60	$ (484)	$ (807)
Defined benefit plan, plan assets, increase (decrease) for actual return (loss)		5,120	(1,919)
Defined benefit plan, plan assets, contributions by employer		$ 3,697	$ 1,343
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		3.30%	4.20%	3.70%
Pension Plan | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Current asset allocation target for fixed income securities			100.00%