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Revenue (Narrative) (Details)
item in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Feb. 28, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
item
Sep. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2014
USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                  
Lease term   30 years   30 years   30 years      
Lease extension   10 years   10 years   10 years      
Revenue recognized           $ (364,000)      
Contract liability   $ 8,056,000   $ 8,056,000   8,056,000   $ 2,983,000  
Contract and contract acquisition costs           127,000      
Spectrum [Member]                  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                  
Revenue recognized       $ 182,000 $ 182,000 $ 364,000 $ 364,000    
Contract liability                 $ 7,500,000
Contractual term   10 years   10 years   10 years      
TeamConnect LLC [Member]                  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                  
Service fee term           24 months      
Ameren [Member]                  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                  
Number of people | item           7.5      
Lease term   30 years   30 years   30 years      
Lease extension   10 years   10 years   10 years      
Scheduled prepayments   $ 47,700,000   $ 47,700,000   $ 47,700,000      
Lessor Operating Lease Payments Received   $ 5,400,000 $ 300,000            
Ameren [Member] | Subsequent Event [Member]                  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                  
Lessor Operating Lease Payments Received $ 17,200,000                
Ameren [Member] | Maximum [Member]                  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                  
Lease term   40 years   40 years   40 years      
TeamConnect LLC [Member]                  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                  
Revenue recognized       $ 0 $ 66,000 $ 0 $ 140,000    
Evergy [Member]                  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                  
Number of people | item           3.9      
Lease term   20 years   20 years   20 years      
Lease extension   10 years   10 years   10 years      
Scheduled prepayments   $ 30,200,000   $ 30,200,000   $ 30,200,000      
Evergy [Member] | Maximum [Member]                  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                  
Lease term   40 years   40 years   40 years