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EQUITY INVESTMENTS - Carrying Value of Equity Method Investments Without Determinable Fair Values (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024
Net Investment Income [Line Items] |  |  |  |
Total cost method investments | $ 123,412 | $ 116,141 |  |
Total equity method investments | 692,400 | 635,411 |  |
Equity investments | 815,812 | 751,552 |  |
MBI Net Option |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Other noncurrent assets | $ 84,120 | $ 79,450 |  |
MetroNet |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Cost method investment, ownership percentage (in percent) | 10.00% | 10.00% |  |
Total cost method investments | $ 7,000 | $ 7,000 |  |
Point Broadband |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Cost method investment, ownership percentage (in percent) | 10.00% | 10.00% |  |
Total cost method investments | $ 42,623 | $ 42,623 |  |
Visionary |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Cost method investment, ownership percentage (in percent) | 10.00% | 10.00% |  |
Total cost method investments | $ 8,822 | $ 8,822 |  |
Ziply |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Cost method investment, ownership percentage (in percent) | 10.00% | 10.00% |  |
Total cost method investments | $ 50,000 | $ 50,000 |  |
Others |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Cost method investment, ownership percentage (in percent) | 10.00% | 10.00% |  |
Total cost method investments | $ 14,967 | $ 7,696 |  |
Clearwave Fiber |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Equity method investment, ownership percentage (in percent) | 57.00% | 57.00% |  |
Total equity method investments | $ 180,882 | $ 126,031 |  |
MBI |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Equity method investment, ownership percentage (in percent) | 45.00% | 45.00% |  | 45.00%
Total equity method investments | $ 405,810 | $ 402,266 |  |
Non-cash impairment charge | $ 111,700 |  |  |
Nextlink |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Equity method investment, ownership percentage (in percent) | 22.00% | 22.00% | 22.00% |
Total equity method investments | $ 105,708 | $ 107,114 |  |

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