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Restructuring and Other Costs, Net - Schedule of Accrual Activity Relating to Restructuring Reserves (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Restructuring Cost And Reserve [Line Items]        
Balance at September 30, 2022     $ 5,154  
Restructuring and other costs, net $ 5,714 $ 474 9,903 $ 5,389
Non-cash adjustments     (327)  
Cash payments     (9,598)  
Effect of foreign currency translation     6  
Balance at March 31, 2023 5,138   5,138  
Personnel        
Restructuring Cost And Reserve [Line Items]        
Balance at September 30, 2022     1,277  
Restructuring and other costs, net 3,371 13 6,420 250
Cash payments     (5,509)  
Effect of foreign currency translation     (5)  
Balance at March 31, 2023 2,183   2,183  
Facilities        
Restructuring Cost And Reserve [Line Items]        
Balance at September 30, 2022     1,600  
Restructuring and other costs, net 150 170 343 367
Non-cash adjustments     (327)  
Cash payments     (299)  
Effect of foreign currency translation     11  
Balance at March 31, 2023 1,328   1,328  
Restructuring Subtotal        
Restructuring Cost And Reserve [Line Items]        
Balance at September 30, 2022     2,877  
Restructuring and other costs, net 3,521 183 6,763 617
Non-cash adjustments     (327)  
Cash payments     (5,808)  
Effect of foreign currency translation     6  
Balance at March 31, 2023 3,511   3,511  
Other        
Restructuring Cost And Reserve [Line Items]        
Balance at September 30, 2022     2,277  
Restructuring and other costs, net 2,193 $ 291 3,140 $ 4,772
Cash payments     (3,790)  
Balance at March 31, 2023 $ 1,627   $ 1,627