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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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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of other-than-temporary decline in value that has been recognized against investment accounted for under equity method of accounting.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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