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Restructuring and other related costs - Restructuring related liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2018
Restructuring Reserve [Roll Forward]          
Restructuring expense (income) $ 22,176 $ 0 $ 2,641 $ (5,982) $ 0
Employee severance and related expenses          
Restructuring Reserve [Roll Forward]          
Beginning balance 0   0 96  
Restructuring expense (income) 600     (22)  
Cash disbursements (504)     (74)  
Other adjustments 0        
Ending balance 96     0 0
Other costs          
Restructuring Reserve [Roll Forward]          
Beginning balance 0   0 675  
Restructuring expense (income) 1,118     1,634  
Cash disbursements (443)     (2,309)  
Other adjustments 0        
Ending balance 675     0 0
Employee severance and related expenses and other costs          
Restructuring Reserve [Roll Forward]          
Beginning balance 0   $ 0 771  
Restructuring expense (income) 1,718     1,612  
Cash disbursements (947)     (2,383)  
Other adjustments 0        
Ending balance $ 771     $ 0 $ 0