Restructuring and Other Costs, Net - Schedule of Accrual Activity Relating to Restructuring Reserves (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Restructuring Cost And Reserve [Line Items]
Balance as of September 30, 2023	$ 4,330
Restructuring and other costs, net	11,062	$ 705
Non-cash adjustments	(2,963)
Cash payments	(8,919)
Effect of foreign currency translation	(41)
Balance at March 31, 2024	3,469
Personnel
Restructuring Cost And Reserve [Line Items]
Balance as of September 30, 2023	3,758
Restructuring and other costs, net	10,196	115
Non-cash adjustments	(2,963)
Cash payments	(8,428)
Effect of foreign currency translation	(41)
Balance at March 31, 2024	2,522
Other
Restructuring Cost And Reserve [Line Items]
Balance as of September 30, 2023	572
Restructuring and other costs, net	866	$ 445
Non-cash adjustments	0
Cash payments	(491)
Balance at March 31, 2024	$ 947