Restructuring and Other Costs, Net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	$ 11,917	$ 8,965	$ 5,092
Severance Charge
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	7,778	1,676	1,689
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	$ 460	673	1,394
Other One-Time Charges
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net		2,600	$ 2,000
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