| Schedule 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, 2022 (In thousands) | Amortized Cost
 |  | Gross Unrealized
 Gains
 |  | Gross Unrealized
 Losses
 |  | Fair Value
 |  
| Corporate debt securities | $ | 477,237 |  |  | $ | 18 |  |  | $ | (6,244) |  |  | $ | 471,011 |  |  
| Money market funds and other | 734,466 |  |  | — |  |  | — |  |  | 734,466 |  |  
|  |  |  |  |  |  |  |  |  
| Municipal securities | 66,714 |  |  | — |  |  | (1,011) |  |  | 65,703 |  |  
| Sovereign securities | 6,044 |  |  | 2 |  |  | (46) |  |  | 6,000 |  |  
| U.S. Government agency securities | 115,223 |  |  | 38 |  |  | (1,012) |  |  | 114,249 |  |  
| U.S. Treasury securities | 355,576 |  |  | 13 |  |  | (6,771) |  |  | 348,818 |  |  
| 
Equity securities(1)
 | 3,211 |  |  | 12,585 |  |  | — |  |  | 15,796 |  |  
|  |  |  |  |  |  |  |  |  
| Subtotal | 1,758,471 |  |  | 12,656 |  |  | (15,084) |  |  | 1,756,043 |  |  
| 
Add: Time deposits(2)
 | 270,290 |  |  | — |  |  | — |  |  | 270,290 |  |  
| Less: Cash equivalents | 863,609 |  |  | — |  |  | — |  |  | 863,609 |  |  
| Marketable securities | $ | 1,165,152 |  |  | $ | 12,656 |  |  | $ | (15,084) |  |  | $ | 1,162,724 |  |  
|  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| As of June 30, 2021 (In thousands) | Amortized Cost
 |  | Gross Unrealized
 Gains
 |  | Gross Unrealized
 Losses
 |  | Fair Value
 |  
| Corporate debt securities | $ | 468,192 |  |  | $ | 689 |  |  | $ | (135) |  |  | $ | 468,746 |  |  
| Money market funds and other | 691,375 |  |  | — |  |  | — |  |  | 691,375 |  |  
| Municipal securities | 70,155 |  |  | 106 |  |  | (33) |  |  | 70,228 |  |  
| Sovereign securities | 3,045 |  |  | 7 |  |  | — |  |  | 3,052 |  |  
| U.S. Government agency securities | 145,810 |  |  | 160 |  |  | (49) |  |  | 145,921 |  |  
| U.S. Treasury securities | 233,052 |  |  | 129 |  |  | (117) |  |  | 233,064 |  |  
| 
Equity securities(1)
 | 3,211 |  |  | 26,719 |  |  | — |  |  | 29,930 |  |  
|  |  |  |  |  |  |  |  |  
| Subtotal | 1,614,840 |  |  | 27,810 |  |  | (334) |  |  | 1,642,316 |  |  
| 
Add: Time deposits(2)
 | 210,636 |  |  | — |  |  | — |  |  | 210,636 |  |  
| Less: Cash equivalents | 793,040 |  |  | — |  |  | — |  |  | 793,040 |  |  
| Marketable securities | $ | 1,032,436 |  |  | $ | 27,810 |  |  | $ | (334) |  |  | $ | 1,059,912 |  | ________________ (1)   Unrealized gains on equity securities included in our portfolio include the initial fair value adjustment recorded upon a security becoming marketable. (2)   Time deposits excluded from fair value measurements. | 
| Schedule of Investments with Gross Unrealized Losses | The following table summarizes the fair value and gross unrealized losses of our investments that were in an unrealized loss position as of the date indicated below. 
|  |  |  |  |  |  |  |  |  |  |  |  |  
| As of March 31, 2022 (In thousands) | Fair Value |  | Gross Unrealized
 Losses
 |  
| Corporate debt securities | $ | 439,540 |  |  | $ | (6,244) |  |  
| Sovereign securities | 2,969 |  |  | (46) |  |  
| Municipal securities | 65,352 |  |  | (1,011) |  |  
| U.S. Government agency securities | 75,936 |  |  | (1,012) |  |  
| U.S. Treasury securities | 333,334 |  |  | (6,771) |  |  
| Total | $ | 917,131 |  |  | $ | (15,084) |  | 
 
|  |  |  |  |  |  |  |  |  |  |  |  |  
| As of June 30, 2021 (In thousands) | Fair Value |  | Gross Unrealized
 Losses
 |  
| Corporate debt securities | $ | 161,012 |  |  | $ | (135) |  |  
|  |  |  |  |  
| Municipal securities | 21,605 |  |  | (33) |  |  
| U.S. Government agency securities | 38,904 |  |  | (49) |  |  
| U.S. Treasury securities | 117,761 |  |  | (117) |  |  
| Total | $ | 339,282 |  |  | $ | (334) |  |  | 
| Schedule of Contractual Maturities of Securities | The contractual maturities of securities classified as available-for-sale, regardless of their classification on our Condensed Consolidated Balance Sheets, as of the date indicated below were as follows: 
|  |  |  |  |  |  |  |  |  |  |  |  |  
| As of March 31, 2022 (In thousands) | Amortized Cost |  | Fair Value |  
| Due within one year | $ | 550,125 |  |  | $ | 560,500 |  |  
| Due after one year through three years | 615,027 |  |  | 602,224 |  |  
| Total | $ | 1,165,152 |  |  | $ | 1,162,724 |  |  |