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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Operating Loss Carryforwards [Line Items]          
Provision for income taxes $ 14,467 $ 9,309 $ 18,405 $ 10,295  
Effective income tax rates (as a percent) 11.00% 7.60% 7.20% 4.60%  
Full statutory income tax rate (as a percent) 13.67%        
Discrete tax benefit from adjustment of deferred tax assets and liabilities in Switzerland     $ 1,700    
Discrete tax benefits from reversal of uncertain tax positions     2,700 $ 2,300  
Unrecognized tax benefits $ 85,000   85,000   $ 76,500
Accrued interest and penalties related to uncertain tax positions 2,700   2,700   2,500
Expected decrease in uncertain tax positions 4,100   4,100    
Non-current income tax payable          
Operating Loss Carryforwards [Line Items]          
Unrecognized tax benefits $ 38,200   38,200   $ 36,400
UNITED STATES          
Operating Loss Carryforwards [Line Items]          
Discrete tax benefits from recognition of excess tax benefits in the United States     $ 6,000 $ 9,500