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MARKETABLE SECURITIES - Amortized Cost and Fair Value (Details) | Sep. 30, 2020 USD ($) investment | Jun. 30, 2020 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,434,736,000 | $ 1,390,874,000
Gross Unrealized Gains | 3,734,000 | 4,748,000
Gross Unrealized Losses | (96,000) | (59,000)
Fair Value | 1,438,374,000 | 1,395,563,000
Add: Time deposits | 133,836,000 | 124,153,000
Marketable securities, Amortized Cost | 823,995,000 | 741,374,000
Marketable securities, Gross Unrealized Gains | 3,734,000 | 4,748,000
Marketable securities, Gross Unrealized Losses | (96,000) | (59,000)
Marketable securities, Fair value | $ 827,633,000 | 746,063,000
Number of investments in an unrealized loss position | investment | 40 |
Investments in continuous loss position, 12 months or more | $ 0 |
Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 744,577,000 | 773,653,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 744,577,000 | 773,653,000
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 402,338,000 | 379,334,000
Gross Unrealized Gains | 2,046,000 | 2,673,000
Gross Unrealized Losses | (88,000) |
Fair Value | 404,296,000 | 381,957,000
Money market funds and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 682,785,000 | 694,950,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 682,785,000 | 694,950,000
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 35,368,000 | 28,859,000
Gross Unrealized Gains | 261,000 | 251,000
Gross Unrealized Losses | 0 |
Fair Value | 35,629,000 | 29,110,000
Sovereign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 2,009,000
Gross Unrealized Gains |  | 8,000
Gross Unrealized Losses |  | 0
Fair Value |  | 2,017,000
U.S. Government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 137,169,000 | 106,091,000
Gross Unrealized Gains | 326,000 | 252,000
Gross Unrealized Losses | (8,000) |
Fair Value | 137,487,000 | 106,336,000
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 177,076,000 | 179,631,000
Gross Unrealized Gains | 1,101,000 | 1,564,000
Gross Unrealized Losses | 0 |
Fair Value | $ 178,177,000 | $ 181,193,000
Corporate and Government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment portfolio, maximum maturity term | 3 years |

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