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FAIR VALUE MEASUREMENTS - NARRATIVE (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Debt Instrument [Line Items]        
General and administrative   $ 247,828 $ 211,409 $ 192,452
Performance measurement period   24 months    
1.00% Convertible Notes due 2018        
Debt Instrument [Line Items]        
Interest rate   1.00%    
Estimated fair value of convertible notes   $ 36,799    
Social Point        
Debt Instrument [Line Items]        
Contingent earn-out $ 6,409      
Other long-term liabilities | Fair Value, Measurements, Recurring        
Debt Instrument [Line Items]        
Contingent consideration     $ (6,465)  
Other long-term liabilities | Fair Value, Measurements, Recurring | Social Point        
Debt Instrument [Line Items]        
Contingent consideration   $ 0