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MARKETABLE SECURITIES - Amortized Cost and Fair Value (Details) | Dec. 31, 2020 USD ($) investment | Jun. 30, 2020 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,590,940,000 | $ 1,390,874,000
Gross Unrealized Gains | 2,646,000 | 4,748,000
Gross Unrealized Losses | (30,000) | (59,000)
Fair Value | 1,593,556,000 | 1,395,563,000
Add: Time deposits | 160,301,000 | 124,153,000
Marketable securities, Amortized Cost | 862,449,000 | 741,374,000
Marketable securities, Gross Unrealized Gains | 2,645,000 | 4,748,000
Marketable securities, Gross Unrealized Losses | (30,000) | (59,000)
Marketable securities, Fair value | $ 865,064,000 | 746,063,000
Number of investments in an unrealized loss position | investment | 39 |
Investments in continuous loss position, 12 months or more | $ 0 |
Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 888,792,000 | 773,653,000
Gross Unrealized Gains | 1,000 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 888,793,000 | 773,653,000
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 416,926,000 | 379,334,000
Gross Unrealized Gains | 1,445,000 | 2,673,000
Gross Unrealized Losses | (23,000) |
Fair Value | 418,348,000 | 381,957,000
Money market funds and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 795,712,000 | 694,950,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 795,712,000 | 694,950,000
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 39,190,000 | 28,859,000
Gross Unrealized Gains | 165,000 | 251,000
Gross Unrealized Losses | (3,000) |
Fair Value | 39,352,000 | 29,110,000
Sovereign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,056,000 | 2,009,000
Gross Unrealized Gains | 3,000 | 8,000
Gross Unrealized Losses | 0 | 0
Fair Value | 3,059,000 | 2,017,000
U.S. Government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 145,774,000 | 106,091,000
Gross Unrealized Gains | 325,000 | 252,000
Gross Unrealized Losses | (3,000) |
Fair Value | 146,096,000 | 106,336,000
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 190,282,000 | 179,631,000
Gross Unrealized Gains | 708,000 | 1,564,000
Gross Unrealized Losses | (1,000) |
Fair Value | $ 190,989,000 | $ 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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