Restructuring and Other Costs, Net - Schedule of Accrual Activity Relating to Restructuring Reserves (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Balance at October 1, 2019	$ 4,391
Restructuring and other costs, net	7,554	$ 3,127
Cash payments	(3,210)
Foreign exchange impact on ending balance	9
Balance at December 31, 2019	8,744
Personnel
Restructuring Cost and Reserve [Line Items]
Balance at October 1, 2019	489
Restructuring and other costs, net	360	(663)
Cash payments	(201)
Foreign exchange impact on ending balance	8
Balance at December 31, 2019	656
Facilities
Restructuring Cost and Reserve [Line Items]
Balance at October 1, 2019	26
Restructuring and other costs, net		2,055
Cash payments	(5)
Foreign exchange impact on ending balance	1
Balance at December 31, 2019	22
Spin-Off
Restructuring Cost and Reserve [Line Items]
Balance at October 1, 2019	3,876
Restructuring and other costs, net	7,194	$ 1,735
Cash payments	(3,004)
Balance at December 31, 2019	$ 8,066