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MARKETABLE SECURITIES - Amortized Cost and Fair Value (Details) $ in Thousands | Sep. 30, 2023 USD ($) investment | Jun. 30, 2023 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale securities, fair value | $ 1,637,751 |
Money market funds and other | 1,077,456 | $ 1,257,223
Equity securities, amortized cost | 3,211 | 3,211
Equity securities, gross unrealized gains | 10,614 | 14,948
Equity securities, gross unrealized losses | 0 | 0
Equity securities, fair value | 13,825 | 18,159
Subtotal, amortized cost | 2,549,067 | 2,474,443
Subtotal, gross unrealized gains | 10,669 | 15,014
Subtotal, gross unrealized losses | (15,085) | (16,350)
Subtotal, fair value | 2,544,651 | 2,473,107
Add: Time deposits | 492,767 | 471,439
Cash equivalents, amortized cost | 1,399,666 | 1,629,248
Cash equivalents, gross unrealized gains | 1 | 4
Cash equivalents, gross unrealized losses | 0 | 0
Cash equivalents, fair value | 1,399,667 | 1,629,252
Marketable securities, amortized cost | 1,642,168 | 1,316,634
Marketable securities, gross unrealized gains | 10,668 | 15,010
Marketable securities, gross unrealized losses | (15,085) | (16,350)
Marketable securities, fair value | $ 1,637,751 | 1,315,294
Number of investments in an unrealized loss position | investment | 591 |
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 687,213 | 508,511
Available-for-sale securities, gross unrealized gains | 48 | 52
Available-for-sale securities, gross unrealized losses | (6,016) | (5,913)
Available-for-sale securities, fair value | 681,245 | 502,650
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 31,032 | 32,525
Available-for-sale securities, gross unrealized gains | 2 | 0
Available-for-sale securities, gross unrealized losses | (556) | (737)
Available-for-sale securities, fair value | 30,478 | 31,788
U.S. Government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 134,563 | 134,486
Available-for-sale securities, gross unrealized gains | 0 | 4
Available-for-sale securities, gross unrealized losses | (876) | (918)
Available-for-sale securities, fair value | 133,687 | 133,572
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 615,592 | 538,487
Available-for-sale securities, gross unrealized gains | 5 | 10
Available-for-sale securities, gross unrealized losses | (7,637) | (8,782)
Available-for-sale securities, fair value | $ 607,960 | $ 529,715
Corporate and Government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment portfolio, maximum maturity term | 3 years |

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