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MARKETABLE SECURITIES - Amortized Cost and Fair Value (Details) | Dec. 31, 2021 USD ($) investment | Jun. 30, 2021 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ 1,138,413,000 |
Available-for-sale securities, fair value | 1,153,404,000 |
Money market funds and other | 776,782,000 | $ 691,375,000
Equity securities, amortized cost | 3,211,000 | 3,211,000
Equity securities, gross unrealized gains | 17,822,000 | 26,719,000
Equity securities, gross unrealized losses | 0 | 0
Equity securities, fair value | 21,033,000 | 29,930,000
Subtotal, amortized cost | 1,750,566,000 | 1,614,840,000
Subtotal, gross unrealized gains | 17,998,000 | 27,810,000
Subtotal, gross unrealized losses | (3,007,000) | (334,000)
Subtotal, fair value | 1,765,557,000 | 1,642,316,000
Add: Time deposits | 261,942,000 | 210,636,000
Less: Cash equivalents | 874,095,000 | 793,040,000
Marketable securities, amortized cost | 1,138,413,000 | 1,032,436,000
Marketable securities, fair value | $ 1,153,404,000 | 1,059,912,000
Number of investments in an unrealized loss position | investment | 488 |
Investments in continuous loss position, 12 months or more | $ 0 |
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 481,191,000 | 468,192,000
Available-for-sale securities, gross unrealized gains | 95,000 | 689,000
Available-for-sale securities, gross unrealized losses | (1,312,000) | (135,000)
Available-for-sale securities, fair value | 479,974,000 | 468,746,000
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 67,501,000 | 70,155,000
Available-for-sale securities, gross unrealized gains | 14,000 | 106,000
Available-for-sale securities, gross unrealized losses | (247,000) | (33,000)
Available-for-sale securities, fair value | 67,268,000 | 70,228,000
Sovereign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 5,036,000 | 3,045,000
Available-for-sale securities, gross unrealized gains | 5,000 | 7,000
Available-for-sale securities, gross unrealized losses | (10,000) | 0
Available-for-sale securities, fair value | 5,031,000 | 3,052,000
U.S. Government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 121,255,000 | 145,810,000
Available-for-sale securities, gross unrealized gains | 58,000 | 160,000
Available-for-sale securities, gross unrealized losses | (224,000) | (49,000)
Available-for-sale securities, fair value | 121,089,000 | 145,921,000
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 295,590,000 | 233,052,000
Available-for-sale securities, gross unrealized gains | 4,000 | 129,000
Available-for-sale securities, gross unrealized losses | (1,214,000) | (117,000)
Available-for-sale securities, fair value | $ 294,380,000 | $ 233,064,000
Corporate and Government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment portfolio, maximum maturity term | 3 years |

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