| Summary of Marketable Securities | 
The amortized cost and fair value of marketable securities as of the dates indicated below were as follows: 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| As of March 31, 2014 (In thousands) | Amortized Cost |   | Gross Unrealized Gains |   | Gross Unrealized Losses |   | Fair Value |  
| U.S. Treasury securities | $ | 302,408 | 
 |   | $ | 112 | 
 |   | $ | (95 | ) |   | $ | 302,425 | 
 |  
| U.S. Government agency securities | 797,451 | 
 |   | 656 | 
 |   | (464 | ) |   | 797,643 | 
 |  
| Municipal securities | 101,846 | 
 |   | 120 | 
 |   | (72 | ) |   | 101,894 | 
 |  
| Corporate debt securities | 1,178,548 | 
 |   | 3,025 | 
 |   | (321 | ) |   | 1,181,252 | 
 |  
| Money market and other | 463,828 | 
 |   | — | 
 |   | — | 
 |   | 463,828 | 
 |  
| Sovereign securities | 62,261 | 
 |   | 38 | 
 |   | (17 | ) |   | 62,282 | 
 |  
| Subtotal | 2,906,342 | 
 |   | 3,951 | 
 |   | (969 | ) |   | 2,909,324 | 
 |  
| 
Add: Time deposits(1)
 | 31,011 | 
 |   | — | 
 |   | — | 
 |   | 31,011 | 
 |  
| Less: Cash equivalents | 689,740 | 
 |   | — | 
 |   | (6 | ) |   | 689,734 | 
 |  
| Marketable securities | $ | 2,247,613 | 
 |   | $ | 3,951 | 
 |   | $ | (963 | ) |   | $ | 2,250,601 | 
 | 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| As of June 30, 2013 (In thousands) | AmortizedCost
 |   | GrossUnrealized
 Gains
 |   | GrossUnrealized
 Losses
 |   | FairValue
 |  
| 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 March 31, 2014 (In thousands) | Fair Value |   | Gross  Unrealized  
Losses(1)
 |  
| U.S. Treasury securities | $ | 61,901 | 
 |   | $ | (93 | ) |  
| U.S. Government agency securities | 229,366 | 
 |   | (464 | ) |  
| Municipal securities | 36,699 | 
 |   | (72 | ) |  
| Corporate debt securities | 217,279 | 
 |   | (318 | ) |  
| Sovereign securities | 31,455 | 
 |   | (16 | ) |  
| Total | $ | 576,700 | 
 |   | $ | (963 | ) |  __________________  
|  |  |  
| (1) | 
Of the total gross unrealized losses, the amount of total gross unrealized losses related to investments 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 Condensed Consolidated Balance Sheet, as of the date indicated below were as follows: 
|  |  
|  |  |  |  |  |  |  |  |  
| As of March 31, 2014 (In thousands) | Amortized Cost |   | Fair Value |  
| Due within one year | $ | 725,478 | 
 |   | $ | 726,799 | 
 |  
| Due after one year through three years | 1,522,135 | 
 |   | 1,523,802 | 
 |  
|   | $ | 2,247,613 | 
 |   | $ | 2,250,601 | 
 |  |