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Description of the business: (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
May 01, 2023
USD ($)
installment
Sep. 30, 2025
USD ($)
country
Sep. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2025
USD ($)
country
MB
GB
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Description of the business:                
Number of countries entity operates | country   57       57    
Estimated payment related to acquired short-term lease obligations $ 157,200              
Estimated Purchase Agreement payment to be received, amount of discount   $ 4,455       $ 4,455   $ 5,755
Lease liability   333,888       333,888    
Acquisition related costs             $ 21,407  
Adjustment to reclassify, right-of-use leased assets         $ 24,900      
Unfavorable lease liabilities         160,900      
Optical fiber and rights of way                
Description of the business:                
Total property and equipment 369,200              
Commercial Agreement                
Description of the business:                
Amount due to the seller           600   $ 2,600
Amount due from the seller recorded during the period   400 $ 4,100     2,100 13,200  
IP Transit Services Agreement | T-Mobile USA, Inc.,                
Description of the business:                
Amount payable 700,000              
Amortization of discount resulted in interest income   3,900 5,400     12,900 18,700  
Amounts due from Seller - IP Transit Services Agreement, amount of discount 79,600              
Consideration paid   25,000 25,000     $ 75,000 179,200  
IP Transit Services Agreement | Equal monthly installments during the first year after the Closing | T-Mobile USA, Inc.,                
Description of the business:                
Amount payable 350,000              
IP Transit Services Agreement | Equal monthly installments over the subsequent 42 months | T-Mobile USA, Inc.,                
Description of the business:                
Amount payable 350,000              
IP Transit Services Agreement | Per Month During First Year After Closing Date | T-Mobile USA, Inc.,                
Description of the business:                
Amount payable 29,200              
IP Transit Services Agreement | Per Month Over Subsequent Forty Two Months | T-Mobile USA, Inc.,                
Description of the business:                
Amount payable 8,300              
IP Transit Services Agreement | T-Mobile affiliate                
Description of the business:                
Amount payable $ 700,000              
Transition Services Agreement                
Description of the business:                
Agreement term (in years) 2 years              
Extension period (in years) 1 year              
Period of prior written notice (in days) 30 days              
Maturity period from receipt of the related invoice for amount billed under the agreement (in days)           30 days    
Amount due to the seller recorded during the period     3,000       26,300  
Amount paid to the seller     3,700       91,900  
Wireline Network Holdings LLC                
Description of the business:                
Cash and cash equivalents $ 47,074              
Estimated Purchase Agreement payment to be received, amount of discount 8,392              
Reduction in short term lease payment       $ 24,200        
Amounts due from Seller - IP Transit Services Agreement, amount of discount 79,610              
Consideration paid 1         $ 1    
Acquisition related costs   0 12,400     0 21,400  
Total property and equipment 965,715              
Wireline Network Holdings LLC | Buyer                
Description of the business:                
Short term lease payment           5,000    
Wireline Network Holdings LLC | Purchase Agreement                
Description of the business:                
Amount payable 1              
Severance costs           28,600    
Acquisition related costs 13,600              
Wireline Network Holdings LLC | Purchase Agreement | Buyer                
Description of the business:                
Cash and cash equivalents 43,400              
Working capital adjustment 61,100              
Additional working capital adjustment         5,000      
Estimated payment related to acquired short-term lease obligations $ 28,100              
Estimated payment related to acquired short-term lease obligations, number of equal payments | installment 4              
Estimated Purchase Agreement payment to be received, amount of discount $ 8,400              
Amortization of income   $ 400 $ 400     $ 1,300 300  
Reduction in short term lease payment       17,000 $ 4,800      
Short term lease payment       $ 7,200        
Severance costs             $ 12,300  
Additional consideration due to the seller 5,000              
Wireline Network Holdings LLC | IP Transit Services Agreement | Buyer                
Description of the business:                
Estimated payment related to acquired short-term lease obligations $ 28,100              
Estimated payment related to acquired short-term lease obligations, number of equal payments | installment 4              
Estimated Purchase Agreement payment to be received, amount of discount $ 8,400              
Minimum                
Description of the business:                
On-net service speed range | MB           100    
Minimum | Wireline Network Holdings LLC | Purchase Agreement | Buyer                
Description of the business:                
Estimated payment related to acquired short-term lease obligations, payment period after closing date 55 months              
Minimum | Wireline Network Holdings LLC | IP Transit Services Agreement | Buyer                
Description of the business:                
Estimated payment related to acquired short-term lease obligations, payment period after closing date 55 days              
Maximum                
Description of the business:                
On-net service speed range | GB           400    
Maximum | Wireline Network Holdings LLC | Purchase Agreement | Buyer                
Description of the business:                
Estimated payment related to acquired short-term lease obligations, payment period after closing date 58 months              
Maximum | Wireline Network Holdings LLC | IP Transit Services Agreement | Buyer                
Description of the business:                
Estimated payment related to acquired short-term lease obligations, payment period after closing date 58 days