Restructuring and Other Costs, Net - Schedule of Restructuring and Other Costs, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	$ 474	$ 537	$ 5,389	$ 1,017
Personnel
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	13	45	250	381
Facilities
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	170	447	367	565
Restructuring Subtotal
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	183	492	617	946
Other
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	$ 291	$ 45	$ 4,772	$ 71