Pension Plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Weighted average interest credit rate used in only cash balance pension plans		4.20%
Defined benefit plan, plan assets, increase (decrease) for actual return (loss)		$ (1,900)	$ 2,300	$ 7,400
Defined benefit plan, plan assets, contributions by employer		$ 1,300	$ 3,000	$ 3,000
Forecast
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost	$ 100
Defined benefit plan, plan assets, contributions by employer	600
Defined benefit plan, plan assets, contributions by employer, directly to plans	$ 3,200
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%	5.00%	5.00%
Net periodic pension cost		$ (484)	$ (807)	$ 2,310
Defined benefit plan, plan assets, increase (decrease) for actual return (loss)		(1,919)	2,348
Defined benefit plan, plan assets, contributions by employer		$ 1,343	$ 3,007
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.20%	3.70%	1.00%
Pension Plan | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Current asset allocation target for fixed income securities		100.00%