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MARKETABLE SECURITIES - Amortized Costs and Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
--- | --- | --- | ---
Marketable Securities |  |  |
Amortized Cost | $ 1,390,874 | $ 1,161,649 |
Gross Unrealized Gains | 4,748 | 189 |
Gross Unrealized Losses | (59) | (1,232) |
Fair Value | 1,395,563 | 1,160,606 |
Add: Time deposits | 124,153 | 99,006 |
Marketable securities, Amortized Cost | 741,374 | 724,449 |
Marketable securities, Gross Unrealized Gains | 4,748 | 172 |
Marketable securities, Gross Unrealized Losses | (59) | (1,230) |
Marketable securities, Fair value | 746,063 | 723,391 |
Corporate debt securities |  |  |
Marketable Securities |  |  |
Amortized Cost |  | 433,518 | $ 379,334
Gross Unrealized Gains | 2,673 | 141 |
Gross Unrealized Losses | (50) | (582) |
Fair Value | 381,957 | 433,077 |
Money market funds and other |  |  |
Marketable Securities |  |  |
Amortized Cost | 694,950 | 352,708 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 694,950 | 352,708 |
Municipal securities |  |  |
Marketable Securities |  |  |
Amortized Cost | 28,859 | 1,910 |
Gross Unrealized Gains | 251 | 3 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 29,110 | 1,913 |
Sovereign securities |  |  |
Marketable Securities |  |  |
Amortized Cost | 2,009 | 6,001 |
Gross Unrealized Gains | 8 | 1 |
Gross Unrealized Losses | 0 | (8) |
Fair Value | 2,017 | 5,994 |
U.S. Government agency securities |  |  |
Marketable Securities |  |  |
Amortized Cost | 106,091 | 159,454 |
Gross Unrealized Gains | 252 | 5 |
Gross Unrealized Losses | (7) | (241) |
Fair Value | 106,336 | 159,218 |
U.S. Treasury securities |  |  |
Marketable Securities |  |  |
Amortized Cost | 179,631 | 208,058 |
Gross Unrealized Gains | 1,564 | 39 |
Gross Unrealized Losses | (2) | (401) |
Fair Value | 181,193 | 207,696 |
Cash and Cash Equivalents |  |  |
Marketable Securities |  |  |
Amortized Cost | 773,653 | 536,206 |
Gross Unrealized Gains | 0 | 17 |
Gross Unrealized Losses | 0 | (2) |
Fair Value | $ 773,653 | $ 536,221 |

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