Restructuring and Other Costs, Net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	$ 17,077	$ 11,917	$ 8,965
Severance Charge
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	13,410	7,778	1,676
Consulting Costs
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	2,800
Third Party Fees
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net		3,800
Facilities Closure
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	73	$ 460	673
Other One-Time Charges
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	800		2,600
Professional Services Fees
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	$ 8,100
Stock Based Compensation due to the Resignation of Former CEO
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net			4,000
Stock Based Compensation, Net of Forfeitures, due to the Resignation of Former CEO
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net			$ 5,000