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GOVERNMENT SUPPORT AND SPECTRUM MATTERS (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2022 USD ($) item | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) item | Jul. 31, 2022 USD ($) | Jul. 15, 2022 USD ($) | Jul. 31, 2021 USD ($) | Jun. 30, 2021 USD ($)
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total |  | $ 182,213 | $ 166,760 |  | $ 533,730 | $ 415,135 |  |  |  |  |  |
Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total |  | 173,977 | 155,298 |  | 512,315 | 378,897 |  |  |  |  |  |
USF, CAF II, RDOF and Other Programs | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total |  | 18,029 | 13,760 |  | 51,461 | 30,484 |  |  |  |  |  |
USF, CAF II, RDOF and Other Programs | US Telecom | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total |  | 17,086 | 10,999 |  | 44,959 | 19,338 |  |  |  |  |  |
USF, CAF II, RDOF and Other Programs | International Telecom | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total |  | 943 | 2,761 |  | $ 6,502 | 11,146 |  |  |  |  |  |
Universal Service Fund programs |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number Of Fund Disbursement Programs | item |  |  |  |  | 4 |  |  |  |  |  |  |
High cost support program | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customer |  | 1,934 | 3,601 |  | $ 9,501 | 12,608 |  |  |  |  |  |
High cost support program | US Telecom | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customer |  | 991 | 840 |  | 3,036 | 1,462 |  |  |  |  |  |
High cost support program | International Telecom | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customer |  | 943 | 2,761 |  | 6,465 | 11,146 |  |  |  |  |  |
CAF II | Grant receivable through December 2025 |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount that has been funded or will be funded |  | 27,700 |  |  | 27,700 |  |  |  |  |  |  |
CAF II | Grant receivable from January 2026 through July 2028 |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount that has been funded or will be funded |  | 8,000 |  |  | 8,000 |  |  |  |  |  |  |
CAF II | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customer |  | 6,822 | 5,710 |  | 20,466 | 9,508 |  |  |  |  |  |
CAF II | US Telecom | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue not from contract with customer |  | 6,822 | 5,710 |  | 20,466 | 9,508 |  |  |  |  |  |
TBCP |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional grant funds awarded | $ 52,300 |  |  |  |  |  |  |  |  |  |  |
Grant funds awarded during the period |  |  |  |  | 77,500 |  |  |  |  |  |  |
CARES Act |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Grant Fund Awards |  |  |  |  |  |  |  | $ 16,300 |  |  |  |
Grant funds awarded during the period |  |  |  |  |  |  | $ 2,400 |  |  |  |  |
Grant Funds Used to Offset Fixed Asset Related Costs |  |  |  |  |  |  | 18,400 |  |  |  |  |
Grant Funds Used to Offset Operating Expenses |  |  |  |  |  |  | $ 300 |  |  |  |  |
CBRS Auction |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Initial term of licenses |  |  |  | 10 years |  |  |  |  |  |  |  |
Payment for PALs |  |  |  | $ 20,400 |  |  |  |  |  |  |  |
Repayment for surrender of licenses |  | 1,100 |  |  |  |  |  |  |  |  |  |
Vija's annual USF support |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount that has been funded or will be funded |  |  |  |  |  |  |  |  |  |  | $ 10,900 | $ 16,400
Vija's annual USF support | Grant Receivable June 2022 Through June 2023 |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount that has been funded or will be funded |  |  |  |  |  |  |  |  | $ 5,500 |  |  |
RDOF |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Grant Funds Expected To Be Awarded |  |  |  |  |  |  |  | $ 20,100 |  |  |  |
Grant Fund Term |  |  |  |  |  |  |  | 10 years |  |  |  |
Number Of Households To Receive Broadband Coverage | item |  |  |  |  |  |  |  | 10,000 |  |  |  |
RDOF | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  | 478 |  |  | 1,434 |  |  |  |  |  |  |
RDOF | US Telecom | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  | 478 |  |  | 1,434 |  |  |  |  |  |  |
Other Programs | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  | 8,795 | 4,449 |  | 20,060 | 8,368 |  |  |  |  |  |
Other Programs | US Telecom | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  | 8,795 | $ 4,449 |  | 20,023 | $ 8,368 |  |  |  |  |  |
Other Programs | International Telecom | Communication services |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer |  |  |  |  | 37 |  |  |  |  |  |  |
Remove And Replace Program |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred cost expected to be reimbursed |  | $ 2,100 |  |  | $ 2,100 |  |  |  |  |  |  |
Remove And Replace Program | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Mobility Fund [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of cost reimbursement allocated |  |  |  |  |  |  |  |  |  | $ 207,000 |  |

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