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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 |  |  |

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