| Summary of Marketable Securities | 
         
          The amortized cost and fair value of marketable securities as of the dates indicated below were as follows:
          
          
           
            
             
              |  |  
              |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
              | 
                As of June 30, 2014 (In thousands)
                | 
                Amortized
                
                Cost
                | 
                
                | 
                Gross
                
                Unrealized
                
                Gains
                | 
                
                | 
                Gross
                
                Unrealized
                
                Losses
                | 
                
                | 
                Fair Value
                |  
              | 
                U.S. Treasury securities
                | 
                $
                | 
                384,165
                | 
                
 | 
                
                | 
                $
                | 
                287
                | 
                
 | 
                
                | 
                $
                | 
                (52
                | 
                )
                | 
                
                | 
                $
                | 
                384,400
                | 
                
 |  
              | 
                U.S. Government agency securities
                | 
                867,309
                | 
                
 | 
                
                | 
                651
                | 
                
 | 
                
                | 
                (117
                | 
                )
                | 
                
                | 
                867,843
                | 
                
 |  
              | 
                Municipal securities
                | 
                96,198
                | 
                
 | 
                
                | 
                93
                | 
                
 | 
                
                | 
                (75
                | 
                )
                | 
                
                | 
                96,216
                | 
                
 |  
              | 
                Corporate debt securities
                | 
                1,220,794
                | 
                
 | 
                
                | 
                3,526
                | 
                
 | 
                
                | 
                (152
                | 
                )
                | 
                
                | 
                1,224,168
                | 
                
 |  
              | 
                Money market and other
                | 
                397,517
                | 
                
 | 
                
                | 
                —
                | 
                
 | 
                
                | 
                —
                | 
                
 | 
                
                | 
                397,517
                | 
                
 |  
              | 
                Sovereign securities
                | 
                42,227
                | 
                
 | 
                
                | 
                46
                | 
                
 | 
                
                | 
                (9
                | 
                )
                | 
                
                | 
                42,264
                | 
                
 |  
              | 
                Subtotal
                | 
                3,008,210
                | 
                
 | 
                
                | 
                4,603
                | 
                
 | 
                
                | 
                (405
                | 
                )
                | 
                
                | 
                3,012,408
                | 
                
 |  
              | 
                Add: Time deposits
                (1)
                | 
                33,509
                | 
                
 | 
                
                | 
                —
                | 
                
 | 
                
                | 
                —
                | 
                
 | 
                
                | 
                33,509
                | 
                
 |  
              | 
                Less: Cash equivalents
                | 
                524,149
                | 
                
 | 
                
                | 
                —
                | 
                
 | 
                
                | 
                (8
                | 
                )
                | 
                
                | 
                524,141
                | 
                
 |  
              | 
                Marketable securities
                | 
                $
                | 
                2,517,570
                | 
                
 | 
                
                | 
                $
                | 
                4,603
                | 
                
 | 
                
                | 
                $
                | 
                (397
                | 
                )
                | 
                
                | 
                $
                | 
                2,521,776
                | 
                
 |  
              | 
                
                | 
                
                | 
                
                | 
                
                | 
                
                | 
                
                | 
                
                | 
                
                |  
              | 
                As of June 30, 2013 (In thousands)
                | 
                Amortized
                
                Cost
                | 
                
                | 
                Gross
                
                Unrealized
                
                Gains
                | 
                
                | 
                Gross
                
                Unrealized
                
                Losses
                | 
                
                | 
                Fair Value
                |  
              | 
                U.S. Treasury securities
                | 
                $
                | 
                93,940
                | 
                
 | 
                
                | 
                $
                | 
                53
                | 
                
 | 
                
                | 
                $
                | 
                (206
                | 
                )
                | 
                
                | 
                $
                | 
                93,787
                | 
                
 |  
              | 
                U.S. Government agency securities
                | 
                598,471
                | 
                
 | 
                
                | 
                569
                | 
                
 | 
                
                | 
                (1,009
                | 
                )
                | 
                
                | 
                598,031
                | 
                
 |  
              | 
                Municipal securities
                | 
                103,686
                | 
                
 | 
                
                | 
                71
                | 
                
 | 
                
                | 
                (302
                | 
                )
                | 
                
                | 
                103,455
                | 
                
 |  
              | 
                Corporate debt securities
                | 
                1,103,438
                | 
                
 | 
                
                | 
                2,353
                | 
                
 | 
                
                | 
                (2,466
                | 
                )
                | 
                
                | 
                1,103,325
                | 
                
 |  
              | 
                Money market and other
                | 
                817,608
                | 
                
 | 
                
                | 
                —
                | 
                
 | 
                
                | 
                —
                | 
                
 | 
                
                | 
                817,608
                | 
                
 |  
              | 
                Sovereign securities
                | 
                33,799
                | 
                
 | 
                
                | 
                25
                | 
                
 | 
                
                | 
                (19
                | 
                )
                | 
                
                | 
                33,805
                | 
                
 |  
              | 
                Subtotal
                | 
                2,750,942
                | 
                
 | 
                
                | 
                3,071
                | 
                
 | 
                
                | 
                (4,002
                | 
                )
                | 
                
                | 
                2,750,011
                | 
                
 |  
              | 
                Add: Time deposits
                (1)
                | 
                43,413
                | 
                
 | 
                
                | 
                —
                | 
                
 | 
                
                | 
                —
                | 
                
 | 
                
                | 
                43,413
                | 
                
 |  
              | 
                Less: Cash equivalents
                | 
                859,933
                | 
                
 | 
                
                | 
                —
                | 
                
 | 
                
                | 
                —
                | 
                
 | 
                
                | 
                859,933
                | 
                
 |  
              | 
                Marketable securities
                | 
                $
                | 
                1,934,422
                | 
                
 | 
                
                | 
                $
                | 
                3,071
                | 
                
 | 
                
                | 
                $
                | 
                (4,002
                | 
                )
                | 
                
                | 
                $
                | 
                1,933,491
                | 
                
 |  
          __________________
          
          (1) Time deposits excluded from fair value measurements.
          
          | 
      
       | Investments with Gross Unrealized Losses | 
         
          The following table summarizes the fair value and gross unrealized losses of the Company's investments that were in an unrealized loss position as of the date indicated below:
          
          
           
            
             
              |  |  
              |  |  |  |  |  |  |  |  |  
              | 
                As of June 30, 2014 (In thousands)
                | 
                Fair Value
                | 
                
                | 
                Gross
                
                Unrealized
                
                Losses
                (1)
                |  
              | 
                U.S. Treasury securities
                | 
                $
                | 
                192,159
                | 
                
 | 
                
                | 
                $
                | 
                (52
                | 
                )
                |  
              | 
                U.S. Government agency securities
                | 
                163,701
                | 
                
 | 
                
                | 
                (117
                | 
                )
                |  
              | 
                Municipal securities
                | 
                38,243
                | 
                
 | 
                
                | 
                (73
                | 
                )
                |  
              | 
                Corporate debt securities
                | 
                147,555
                | 
                
 | 
                
                | 
                (146
                | 
                )
                |  
              | 
                Sovereign securities
                | 
                12,816
                | 
                
 | 
                
                | 
                (9
                | 
                )
                |  
              | 
                Total
                | 
                $
                | 
                554,474
                | 
                
 | 
                
                | 
                $
                | 
                (397
                | 
                )
                |  
          __________________
          
          
           
            |  |  |  
            | 
              (1)
              | 
              As of
              June 30, 2014
              , the amount of total gross unrealized losses that had been in a continuous loss position for
              12
              months or more was immaterial.
              |  | 
      
       | Contractual Maturities of Securities | 
         
          The contractual maturities of securities classified as available-for-sale, regardless of their classification on the Company's Consolidated Balance Sheet, as of the date indicated below were as follows:
          
          
           
            
             
              |  |  
              |  |  |  |  |  |  |  |  |  
              | 
                As of June 30, 2014 (In thousands)
                | 
                Amortized
                
                Cost
                | 
                
                | 
                Fair Value
                |  
              | 
                Due within one year
                | 
                $
                | 
                827823年
                | 
                
 | 
                
                | 
                $
                | 
                829,098
                | 
                
 |  
              | 
                Due after one year through three years
                | 
                1,689,747
                | 
                
 | 
                
                | 
                1,692,678
                | 
                
 |  
              | 
                
                | 
                $
                | 
                2,517,570
                | 
                
 | 
                
                | 
                $
                | 
                2,521,776
                | 
                
 |  |