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Income Taxes- Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2015
Income Tax Disclosure [Line Items]          
Provision for income taxes $ 7,004 $ 5,501 $ 5,680 $ 8,596  
Effective income tax rates (as a percent) 27.90% 13.20% 18.20% 13.40%  
Tax benefit from reversal of uncertain tax positions   $ 1,700      
Unrecognized tax benefits $ 80,400   $ 80,400   $ 79,000
Unrecognized tax benefits that would impact effective tax rate 80,400   80,400   79,000
Accrued interest and penalties related to uncertain tax positions 4,700   4,700   4,900
Expected decrease in uncertain tax positions 17,200   17,200    
China          
Income Tax Disclosure [Line Items]          
Discrete tax benefit due to preferential income tax rate reduction     2,200 $ 800  
Stock Compensation | Video conferencing          
Income Tax Disclosure [Line Items]          
Adjustment of deferred Tax Asset 1,500        
Non-current income tax payable          
Income Tax Disclosure [Line Items]          
Unrecognized tax benefits 74,400   74,400   72,100
Current income tax payable          
Income Tax Disclosure [Line Items]          
Unrecognized tax benefits $ 100   $ 100   $ 100