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Nature of Operations (Details) Customer in Thousands, $ in Millions |  | 9 Months Ended
--- | --- | ---
Dec. 29, 2020 USD ($) county Customer | Jun. 30, 2021 county
Mountaineer | Pending |  |
Business Acquisition [Line Items] |  |
Number of counties of operation | county | 50 |
Enterprise value | $ | $ 540 |
Assumption of debt | $ | $ 140 |
Customers served | Customer | 215 |
Gas Utility | MARYLAND |  |
Business Acquisition [Line Items] |  |
Number of counties of operation | county |  | 1

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