Restructuring and Other Costs, Net - Schedule of Accrual Activity Relating to Restructuring Reserves (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost And Reserve [Line Items]
Balance at September 30, 2021	$ 5,035
Restructuring and other costs, net	4,915	$ 480
Non-cash adjustments	(4,151)
Cash (payments) receipts	(2,027)
Foreign exchange impact on ending balance	2
Balance at December 31, 2021	3,774
Personnel
Restructuring Cost And Reserve [Line Items]
Balance at September 30, 2021	1,620
Restructuring and other costs, net	237	336
Cash (payments) receipts	(1,105)
Balance at December 31, 2021	752
Facilities
Restructuring Cost And Reserve [Line Items]
Balance at September 30, 2021	1,881
Restructuring and other costs, net	197	118
Non-cash adjustments	(151)
Cash (payments) receipts	255
Foreign exchange impact on ending balance	2
Balance at December 31, 2021	2,184
Restructuring Subtotal
Restructuring Cost And Reserve [Line Items]
Balance at September 30, 2021	3,501
Restructuring and other costs, net	434	454
Non-cash adjustments	(151)
Cash (payments) receipts	(850)
Foreign exchange impact on ending balance	2
Balance at December 31, 2021	2,936
Other
Restructuring Cost And Reserve [Line Items]
Balance at September 30, 2021	1,534
Restructuring and other costs, net	4,481	$ 26
Non-cash adjustments	(4,000)
Cash (payments) receipts	(1,177)
Balance at December 31, 2021	$ 838