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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Net operating loss and tax credit carryforwards        
Valuation allowance $ 29,858 $ 28,926    
Cumulative amount of unremitted earnings of non-Swiss subsidiaries 245,600      
Deferred income tax liability 6,000      
Unrecognized tax benefits that would impact effective tax rate 176,000 160,300    
Unrecognized tax benefits, uncertain tax positions 179,372 163,253 $ 143,497 $ 76,549
Interest and penalties in income tax expense 1,500 1,100 2,000  
Accrued interest and penalties related to uncertain tax positions 3,600 4,900    
Decrease in uncertain tax positions 4,232 $ 4,024 $ 3,501  
Possible decreases in balances related to lapse of statutes of limitations $ 4,200      
Swiss        
Net operating loss and tax credit carryforwards        
Statutory income tax rate (as a percent) 8.50% 8.50% 8.50%  
Foreign        
Net operating loss and tax credit carryforwards        
Foreign net operating loss carryforwards $ 81,900      
Foreign tax credit carryforwards 74,000      
California Franchise Tax Board | State and Local Jurisdiction        
Net operating loss and tax credit carryforwards        
Valuation allowance 29,700 $ 28,500    
Various Tax Credit Carryforwards        
Net operating loss and tax credit carryforwards        
Valuation allowance   200    
Non-current income tax payable        
Net operating loss and tax credit carryforwards        
Unrecognized tax benefits, uncertain tax positions $ 83,400 $ 59,200