Restructuring and Other Costs, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges (reversal)	$ 7,554	$ 3,127
Severance Charge
Restructuring Cost and Reserve [Line Items]
Restructuring charges (reversal)	360	(663)
Professional Services Fees
Restructuring Cost and Reserve [Line Items]
Restructuring charges (reversal)	$ 7,194	1,735
Facilities Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges (reversal)		$ 2,055