| Unrealized Gain (Loss) on Investments | 
 The amortized cost and fair value of marketable securities as of the dates indicated below were as follows: 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| As of March 31, 2023 (In thousands) | 
Amortized Cost | 
 | 
Gross Unrealized Gains | 
 | 
Gross Unrealized Losses | 
 | 
Fair Value | 
 
| Corporate debt securities | 
$ | 
466,754  | 
 | 
 | 
$ | 
473  | 
 | 
 | 
$ | 
(6,022) | 
 | 
 | 
$ | 
461,205  | 
 | 
 
| Money market funds and other | 
1,080,003  | 
 | 
 | 
—  | 
 | 
 | 
—  | 
 | 
 | 
1,080,003  | 
 | 
 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| Municipal securities | 
36,660  | 
 | 
 | 
—  | 
 | 
 | 
(776) | 
 | 
 | 
35,884  | 
 | 
 
| Sovereign securities | 
5,021  | 
 | 
 | 
—  | 
 | 
 | 
(5) | 
 | 
 | 
5,016  | 
 | 
 
| U.S. Government agency securities | 
118,073  | 
 | 
 | 
127  | 
 | 
 | 
(830) | 
 | 
 | 
117,370  | 
 | 
 
| U.S. Treasury securities | 
431,619  | 
 | 
 | 
466  | 
 | 
 | 
(7,362) | 
 | 
 | 
424,723  | 
 | 
 
Equity securities(1)
  | 
3,211  | 
 | 
 | 
16,628  | 
 | 
 | 
—  | 
 | 
 | 
19,839  | 
 | 
 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| Subtotal | 
2,141,341  | 
 | 
 | 
17,694  | 
 | 
 | 
(14,995) | 
 | 
 | 
2,144,040  | 
 | 
 
Add: Time deposits(2)
  | 
430,719  | 
 | 
 | 
—  | 
 | 
 | 
—  | 
 | 
 | 
430,719  | 
 | 
 
| Less: Cash equivalents | 
1,253,063  | 
 | 
 | 
—  | 
 | 
 | 
—  | 
 | 
 | 
1,253,063  | 
 | 
 
| Marketable securities | 
$ | 
1,318,997  | 
 | 
 | 
$ | 
17,694  | 
 | 
 | 
$ | 
(14,995) | 
 | 
 | 
$ | 
1,321,696  | 
 | 
 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
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 | 
 | 
 | 
 | 
 | 
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 | 
 | 
 | 
 
| As of June 30, 2022 (In thousands) | 
Amortized Cost | 
 | 
Gross Unrealized Gains | 
 | 
Gross Unrealized Losses | 
 | 
Fair Value | 
 
| Corporate debt securities | 
$ | 
481,881  | 
 | 
 | 
$ | 
3  | 
 | 
 | 
$ | 
(8,915) | 
 | 
 | 
$ | 
472,969  | 
 | 
 
| Money market funds and other | 
948,027  | 
 | 
 | 
—  | 
 | 
 | 
—  | 
 | 
 | 
948,027  | 
 | 
 
| Municipal securities | 
61,973  | 
 | 
 | 
—  | 
 | 
 | 
(1,249) | 
 | 
 | 
60,724  | 
 | 
 
| Sovereign securities | 
6,041  | 
 | 
 | 
2  | 
 | 
 | 
(53) | 
 | 
 | 
5,990  | 
 | 
 
| U.S. Government agency securities | 
92,273  | 
 | 
 | 
26  | 
 | 
 | 
(1,183) | 
 | 
 | 
91,116  | 
 | 
 
| U.S. Treasury securities | 
378,871  | 
 | 
 | 
18  | 
 | 
 | 
(8,378) | 
 | 
 | 
370,511  | 
 | 
 
Equity securities(1)
  | 
3,211  | 
 | 
 | 
7,824  | 
 | 
 | 
—  | 
 | 
 | 
11,035  | 
 | 
 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| Subtotal | 
1,972,277  | 
 | 
 | 
7,873  | 
 | 
 | 
(19,778) | 
 | 
 | 
1,960,372  | 
 | 
 
Add: Time deposits(2)
  | 
274,873  | 
 | 
 | 
—  | 
 | 
 | 
—  | 
 | 
 | 
274,873  | 
 | 
 
| Less: Cash equivalents | 
1,112,146  | 
 | 
 | 
—  | 
 | 
 | 
(1) | 
 | 
 | 
1,112,145  | 
 | 
 
| Marketable securities | 
$ | 
1,135,004  | 
 | 
 | 
$ | 
7,873  | 
 | 
 | 
$ | 
(19,777) | 
 | 
 | 
$ | 
1,123,100  | 
 | 
 
  
________________ 
(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. 
 | 
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value | 
The following table summarizes the fair value and gross unrealized losses of our investments that were in an unrealized loss position as of the dates indicated below.
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| As of March 31, 2023 | 
Less than 12 Months | 
 | 
12 Months or Greater | 
 | 
Total | 
 
| (In thousands) | 
Fair Value | 
 | 
Gross  Unrealized  Losses | 
 | 
Fair Value | 
 | 
Gross  Unrealized  Losses | 
 | 
Fair Value | 
 | 
Gross  Unrealized  Losses | 
 
| Corporate debt securities | 
$ | 
163,334  | 
 | 
 | 
$ | 
(1,687) | 
 | 
 | 
$ | 
221,831  | 
 | 
 | 
$ | 
(4,335) | 
 | 
 | 
$ | 
385,165  | 
 | 
 | 
$ | 
(6,022) | 
 | 
 
| Municipal securities | 
8,711  | 
 | 
 | 
(69) | 
 | 
 | 
27,173  | 
 | 
 | 
(707) | 
 | 
 | 
35,884  | 
 | 
 | 
(776) | 
 | 
 
| Sovereign securities | 
3,019  | 
 | 
 | 
—  | 
 | 
 | 
1,997  | 
 | 
 | 
(5) | 
 | 
 | 
5,016  | 
 | 
 | 
(5) | 
 | 
 
| U.S. Government agency securities | 
38,897  | 
 | 
 | 
(125) | 
 | 
 | 
34,650  | 
 | 
 | 
(705) | 
 | 
 | 
73,547  | 
 | 
 | 
(830) | 
 | 
 
| U.S. Treasury securities | 
137,766  | 
 | 
 | 
(1,945) | 
 | 
 | 
206,896  | 
 | 
 | 
(5,417) | 
 | 
 | 
344,662  | 
 | 
 | 
(7,362) | 
 | 
 
| Total | 
$ | 
351,727  | 
 | 
 | 
$ | 
(3,826) | 
 | 
 | 
$ | 
492,547  | 
 | 
 | 
$ | 
(11,169) | 
 | 
 | 
$ | 
844,274  | 
 | 
 | 
$ | 
(14,995) | 
 | 
 
  
  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| As of June 30, 2022 (In thousands) | 
Fair Value(1)
  | 
 | 
 Gross  
Unrealized  
Losses(1)
 
 | 
 
| Corporate debt securities | 
$ | 
458,699  | 
 | 
 | 
$ | 
(8,915) | 
 | 
 
| Municipal securities | 
58,722  | 
 | 
 | 
(1,249) | 
 | 
 
| Sovereign securities | 
2,963  | 
 | 
 | 
(53) | 
 | 
 
| U.S. Government agency securities | 
60,285  | 
 | 
 | 
(1,183) | 
 | 
 
| U.S. Treasury securities | 
336,819  | 
 | 
 | 
(8,378) | 
 | 
 
| Total | 
$ | 
917,488  | 
 | 
 | 
$ | 
(19,778) | 
 | 
 
  
________________ 
(1) As of June 30, 2022, our investments that were in a continuous loss position of 12 months or more, as well as the unrealized losses on those investments, were immaterial. 
 | 
| 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, 2023 (In thousands) | 
Amortized Cost | 
 | 
Fair Value | 
 
| Due within one year | 
$ | 
836,765  | 
 | 
 | 
$ | 
845,394  | 
 | 
 
| Due after one year through three years | 
482,232  | 
 | 
 | 
476,302  | 
 | 
 
| Total | 
$ | 
1,318,997  | 
 | 
 | 
$ | 
1,321,696  | 
 | 
 
  
 |