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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Net operating loss and tax credit carryforwards        
Valuation allowance $ 30,766 $ 29,858    
Cumulative amount of unremitted earnings of non-Swiss subsidiaries 323,800      
Deferred income tax liability 9,500      
Unrecognized tax benefits that would impact effective tax rate 186,800 176,000    
Unrecognized tax benefits, uncertain tax positions 191,000 179,372 $ 163,253 $ 143,497
Interest and penalties in income tax expense 2,700 1,500 1,100  
Accrued interest and penalties related to uncertain tax positions 6,100 3,600    
Decrease in uncertain tax positions 3,586 4,232 $ 4,024  
Possible decreases in balances related to lapse of statutes of limitations 5,000      
Non-current income tax payable        
Net operating loss and tax credit carryforwards        
Unrecognized tax benefits, uncertain tax positions 106,400 $ 83,400    
Swiss Federal Tax Administration (FTA)        
Net operating loss and tax credit carryforwards        
Foreign net operating loss carryforwards $ 17,700      
Swiss        
Net operating loss and tax credit carryforwards        
Statutory income tax rate (as a percent) 8.50% 8.50% 8.50%  
State and Local Jurisdiction | California Franchise Tax Board        
Net operating loss and tax credit carryforwards        
Valuation allowance $ 30,800 $ 29,700    
Foreign        
Net operating loss and tax credit carryforwards        
Foreign net operating loss carryforwards 60,200      
Foreign tax credit carryforwards $ 74,600