Restructuring and Other Costs, Net - Schedule of Restructuring Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net	$ 2,870	$ 4,329	$ 10,424	$ 7,456
Personnel
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net	321	220	681	(443)
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net		(381)		1,674
Spin-Off
Restructuring Cost and Reserve [Line Items]
Restructuring and other costs, net	$ 2,549	$ 4,490	$ 9,743	$ 6,225