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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Net operating loss and tax credit carryforwards        
Statutory income tax rate (as a percent) 8.50% 8.50% 8.50%  
Valuation allowance $ 6,626 $ 5,338    
Shortfall to equity 2,100 2,300    
Cumulative amount of unremitted earnings of non-Swiss subsidiaries 148,200      
Deferred income tax liability 3,900      
Unrecognized tax benefits, uncertain tax positions 63,667 69,879 $ 79,023 $ 91,046
Reclassification income tax from noncurrent to current (51,797) (59,734)    
Reclassified income tax payable 6,232 1,553    
Interest and penalties in income tax expense 700 300 800  
Accrued interest and penalties related to uncertain tax positions 3,000 3,600 $ 4,900  
Possible decreases in balances related to lapse of statutes of limitations 8,200      
Foreign        
Net operating loss and tax credit carryforwards        
Foreign net operating loss carryforwards 208,300      
Foreign tax credit carryforwards 47,200      
Net operating loss if realized, to be credited to equity 181,500      
Tax credit carryforwards if realized, to be credited to equity 27,200      
Non-current income tax payable        
Net operating loss and tax credit carryforwards        
Unrecognized tax benefits, uncertain tax positions 51,800 59,700    
Current income tax payable        
Net operating loss and tax credit carryforwards        
Unrecognized tax benefits, uncertain tax positions 1,500 $ 100    
California Franchise Tax Board | State and Local Jurisdiction        
Net operating loss and tax credit carryforwards        
Valuation allowance 5,900      
Increase (decrease) in valuation allowance for foreign tax credit carryforwards 1,000      
Various Tax Credit Carryforwards        
Net operating loss and tax credit carryforwards        
Valuation allowance 700      
Reclassification Adjustment | Reclassification From Noncurrent To Current        
Net operating loss and tax credit carryforwards        
Reclassification income tax from noncurrent to current 1,400      
Reclassified income tax payable $ 1,400