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Description of the business: - IRU Finance Lease Termination - Discount and Gain on Lease Termination (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
IRU Finance Lease Termination - Discount and Gain on Lease Termination      
Weighted-average discount rate - finance leases 8.40% 8.20%  
Finance lease liability $ 601,841    
IRU Finance Lease Agreement      
IRU Finance Lease Termination - Discount and Gain on Lease Termination      
Weighted-average discount rate - finance leases     12.00%
Finance lease liability     $ 117,900