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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Net operating loss and tax credit carryforwards          
Decrease in uncertain tax positions   $ 25,075 $ 3,863 $ 3,586  
Amortization period 10 years   10 years    
Expense (benefit) related to reversal of uncertain tax positions     $ 25,100    
Recognition of excess tax benefits     18,700    
Expense (benefit) due to remeasurement of deferred tax assets     5,100    
Valuation allowance   36,537 35,536    
Cumulative amount of unremitted earnings of non-Swiss subsidiaries   546,900      
Deferred income tax liability   18,400      
Unrecognized tax benefits that would impact effective tax rate   152,000 192,700    
Unrecognized tax benefits, uncertain tax positions   151,984 210,215 $ 191,000 $ 179,372
Interest and penalties in income tax expense   (600) 1,700    
Accrued interest and penalties related to uncertain tax positions   7,200 7,800    
Unrecognized tax benefits, uncertain tax positions   32,314      
Non-current income tax payable          
Net operating loss and tax credit carryforwards          
Unrecognized tax benefits, uncertain tax positions   88,500 $ 112,600    
Swiss Federal Tax Administration (FTA)          
Net operating loss and tax credit carryforwards          
Foreign net operating loss carryforwards   36,700      
Unrecognized tax benefits, uncertain tax positions   $ 31,800      
Minimum          
Net operating loss and tax credit carryforwards          
Effective income tax rates (as a percent)     13.61%    
Maximum          
Net operating loss and tax credit carryforwards          
Effective income tax rates (as a percent)   14.28%      
Swiss          
Net operating loss and tax credit carryforwards          
Statutory income tax rate (as a percent)   8.50% 8.50% 8.50%  
Decrease in uncertain tax positions   $ 53,300      
Increase in unrecognized tax benefits   10,000      
Amortization period     10 years    
Expense (benefit) related to reversal of uncertain tax positions     $ 50,100    
State and Local Jurisdiction | California Franchise Tax Board          
Net operating loss and tax credit carryforwards          
Valuation allowance   36,400 $ 35,300    
Foreign          
Net operating loss and tax credit carryforwards          
Foreign net operating loss carryforwards   2,300      
Foreign tax credit carryforwards   $ 76,000