Restructuring and Other Costs, Net - Schedule of Restructuring and Other Costs, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	$ 4,551	$ 5,714	$ 5,256	$ 9,903
Personnel
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	4,404	3,371	4,519	6,420
Facilities
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	147	150	292	343
Restructuring Subtotal
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net	$ 4,551	3,521	4,811	6,763
Other
Restructuring Cost And Reserve [Line Items]
Restructuring and other costs, net		$ 2,193	$ 445	$ 3,140