Restructuring and Other Charges (Credits), 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 Charges	$ (424)	$ 32,410	$ 2,136
Sublease Income	4,749	4,600	4,438
Payments for restructuring	425	40,800	6,681
Restructuring and other charges (credits), net	(460)	36,234	2,211
Saas Transformation
Restructuring Cost And Reserve [Line Items]
Other charges for professional fees		5,100
Impairment and Accretion Expense Related to Exited Facilities
Restructuring Cost And Reserve [Line Items]
Restructuring and other charges (credits), net			100
Impairment and Accretion Exited Lease Facilities
Restructuring Cost And Reserve [Line Items]
Sublease Income		1,300
Employee Severance and Related Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	(143)	32,971	1,887
Payments for restructuring	121	34,023	3,925
Restructured Facilities
Restructuring Cost And Reserve [Line Items]
Payments for restructuring		4,300
Facility Closures
Restructuring Cost And Reserve [Line Items]
Restructuring Charges	(281)	(561)	249
Payments for restructuring	$ 304	2,355	2,756
Restructuring Plan 2022
Restructuring Cost And Reserve [Line Items]
Payments for other professional fees		$ 2,500
Restructuring Plan 2020 | Restructured Facilities
Restructuring Cost And Reserve [Line Items]
Payments for restructuring			$ 2,800