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Regulatory Assets and Liabilities (Narrative) (Details) - USD ($) | Mar. 31, 2020 | Sep. 30, 2019
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Regulatory Assets and Liabilities [Abstract] |  |
Remaining amount of regulatory assets that did not earn a return during the recovery period | $ 14,652,142 | $ 13,700,792

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- Definition Regulatory Assets and Liabilities [Abstract] + References No definition available. + Details
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Namespace Prefix: | rgco_
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Balance Type: | na
Period Type: | duration

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- Definition Remaining balance of regulatory assets for which no return on investment during recovery is provided. In some cases, a regulator may permit an enterprise to include a cost that would be charged to expense by an unregulated enterprise as an allowable cost over a period of time by amortizing that cost for rate-making purposes, but the regulator does not include the unrecovered amount in the rate base. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82849221&loc=d3e44360-110383 + Details
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Period Type: | instant