Restructuring and Other Costs, Net - Schedule of Accrual Activity Relating to Restructuring Reserves (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Restructuring Cost And Reserve [Line Items]
Balance at September 30, 2021			$ 5,035
Restructuring and other costs, net	$ 1,197	$ 1,760	6,586	$ 2,777
Non-cash adjustments			(4,549)
Cash payments			(3,433)
Foreign exchange impact on ending balance			(8)
Balance at June 30, 2022	3,631		3,631
Personnel
Restructuring Cost And Reserve [Line Items]
Balance at September 30, 2021			1,620
Restructuring and other costs, net	1,278		1,528	381
Cash payments			(1,748)
Foreign exchange impact on ending balance			2
Balance at June 30, 2022	1,402		1,402
Facilities
Restructuring Cost And Reserve [Line Items]
Balance at September 30, 2021			1,881
Restructuring and other costs, net	154	447	521	1,012
Non-cash adjustments			(549)
Cash payments			(61)
Foreign exchange impact on ending balance			(10)
Balance at June 30, 2022	1,782		1,782
Restructuring Subtotal
Restructuring Cost And Reserve [Line Items]
Balance at September 30, 2021			3,501
Restructuring and other costs, net	1,432	447	2,049	1,393
Non-cash adjustments			(549)
Cash payments			(1,809)
Foreign exchange impact on ending balance			(8)
Balance at June 30, 2022	3,184		3,184
Other
Restructuring Cost And Reserve [Line Items]
Balance at September 30, 2021			1,534
Restructuring and other costs, net	(235)	$ 1,313	4,537	$ 1,384
Non-cash adjustments			(4,000)
Cash payments			(1,624)
Balance at June 30, 2022	$ 447		$ 447