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v3.20.1

Long-Term Debt (Narrative) (Details) |  |  |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 26, 2020 USD ($) | Dec. 23, 2019 USD ($) | Dec. 06, 2019 USD ($) | Mar. 31, 2020 USD ($) debt_instrument | Sep. 30, 2019 USD ($) | Jun. 13, 2019 USD ($) | Jun. 12, 2019 USD ($) instrument_held
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum percentage of Consolidated Long Term Indebtedness to Consolidated Total Capitalization |  |  |  | 65.00% |  |  |
Roanoke Gas [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 3.60%, due December 6, 2029 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, borrowing amount |  |  | $ 10,000,000 |  |  |  |
Debt term |  |  | 10 years |  |  |  |
Stated percentage rate |  |  | 3.60% | 3.60% |  |  |
Maximum percentage of Priority Indebtedness to Consolidated Total Assets |  |  |  | 15.00% |  |  |
Roanoke Gas [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 4.41%, due March 28, 2031 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated percentage rate |  |  |  | 4.41% |  |  |
Roanoke Gas [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 0.90%, due November 1, 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, borrowing amount |  |  |  | $ 7,000,000 |  |  |
Effective interest rate |  |  |  | 2.30% |  |  |
Maximum percentage of Priority Indebtedness to Consolidated Total Assets |  |  |  | 15.00% |  |  |
Roanoke Gas [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 0.90%, due November 1, 2021 [Member] | 30-day LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate basis points (as a percent) |  |  |  | 0.90% |  |  |
Roanoke Gas [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 3.58%, due October 2, 2027 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated percentage rate |  |  |  | 3.58% |  |  |
Roanoke Gas [Member] | Line of Credit [Member] | Line of Credit, at 30-day LIBOR plus 1.00%, due March 31, 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt term | 2 years |  |  |  |  |  |
Availability fee (as a percent) | 0.15% |  |  |  |  |  |
Roanoke Gas [Member] | Line of Credit [Member] | Line of Credit, at 30-day LIBOR plus 1.00%, due March 31, 2022 [Member] | 30-day LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate basis points (as a percent) | 1.00% |  |  | 1.00% |  |  |
RGC Midstream LLC [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, number of instruments |  |  |  | 2 |  |  | 2
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.35%, due December 29, 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, borrowing amount |  | $ 41,000,000 |  |  | $ 26,000,000 |  |
Maximum percentage of Priority Indebtedness to Consolidated Total Assets |  |  |  | 15.00% |  |  |
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.35%, due December 29, 2022 [Member] | 30-day LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate basis points (as a percent) |  | 1.35% |  | 1.35% |  |  |
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.15%, due June 12, 2026 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, borrowing amount |  |  |  | $ 14,000,000 |  |  | $ 14,000,000
Effective interest rate |  |  |  | 3.24% |  |  | 3.24%
Maximum percentage of Priority Indebtedness to Consolidated Total Assets |  |  |  | 15.00% |  |  |
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.15%, due June 12, 2026 [Member] | 30-day LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate basis points (as a percent) |  |  |  | 1.15% |  |  |
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.20%, due June 1, 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, borrowing amount |  |  |  | $ 10,000,000 |  | $ 10,000,000 |
Effective interest rate |  |  |  | 3.14% |  | 3.14% |
Maximum percentage of Priority Indebtedness to Consolidated Total Assets |  |  |  | 15.00% |  |  |
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.20%, due June 1, 2024 [Member] | 30-day LIBOR [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate basis points (as a percent) |  |  |  | 1.20% |  |  |
Maximum [Member] | Roanoke Gas [Member] | Line of Credit [Member] | Line of Credit, at 30-day LIBOR plus 1.00%, due March 31, 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity | $ 28,000,000 |  |  |  |  |  |
Minimum [Member] | Roanoke Gas [Member] | Line of Credit [Member] | Line of Credit, at 30-day LIBOR plus 1.00%, due March 31, 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity | $ 3,000,000 |  |  |  |  |  |

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