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Investments (Cost Method Investments) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Feb. 28, 2015
Jul. 31, 2014
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Schedule of Cost-method Investments [Line Items]          
Value of shares issued to purchase cost method investment     $ 0.0 $ 0.0 $ 12.0
Telltale          
Schedule of Cost-method Investments [Line Items]          
Cost method investments, amount invested $ 40.0        
Payments to acquire cost method investments $ 28.0        
Shares issued to purchase cost method investment (in shares) 361,229        
Value of shares issued to purchase cost method investment $ 12.0        
Cost method investments, ownership percentage     14.00%    
Next Games          
Schedule of Cost-method Investments [Line Items]          
Payments to acquire cost method investments   $ 2.0