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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Net operating loss and tax credit carryforwards        
Valuation allowance $ 28,926 $ 29,171    
Cumulative amount of unremitted earnings of non-Swiss subsidiaries 153,100      
Deferred income tax liability 2,100      
Unrecognized tax benefits that would impact effective tax rate 160,300 140,800    
Unrecognized tax benefits, uncertain tax positions 163,253 143,497 $ 76,549 $ 69,131
Interest and penalties in income tax expense 1,100 2,000 $ 600  
Accrued interest and penalties related to uncertain tax positions 4,900 $ 4,500    
Possible decreases in balances related to lapse of statutes of limitations $ 4,600      
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 $ 173,100      
Foreign tax credit carryforwards 67,500      
California Franchise Tax Board | State and Local Jurisdiction        
Net operating loss and tax credit carryforwards        
Valuation allowance 28,500 $ 27,700    
Various Tax Credit Carryforwards        
Net operating loss and tax credit carryforwards        
Valuation allowance   400    
Non-current income tax payable        
Net operating loss and tax credit carryforwards        
Unrecognized tax benefits, uncertain tax positions $ 59,200 40,800    
Tax Carryforward        
Net operating loss and tax credit carryforwards        
Valuation allowance   $ 900