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Restructuring Charges - Restructuring Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Restructuring Reserve [Roll Forward]        
Accrued expenses (Beginning balance)     $ 0  
Restructuring charges $ 0 $ 0 7,909 $ 0
Cash payments     (6,644)  
Accrued expenses (Ending balance) $ 1,265   $ 1,265