Restructuring and Other Costs, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost And Reserve [Line Items]
Restructuring charges (reversal)	$ 1,760	$ 3,301	$ 2,777	$ 13,725
Facilities Closure
Restructuring Cost And Reserve [Line Items]
Restructuring charges (reversal)	447		1,012
Other One-Time Charges
Restructuring Cost And Reserve [Line Items]
Restructuring charges (reversal)	$ 1,300		1,400
Severance Charge
Restructuring Cost And Reserve [Line Items]
Restructuring charges (reversal)		2,452	$ 381	3,133
Professional Services Fees
Restructuring Cost And Reserve [Line Items]
Restructuring charges (reversal)		$ 800		$ 10,600