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Nature of Operations (Details)
Customer in Thousands, $ in Millions
6 Months Ended
Dec. 29, 2020
USD ($)
Customer
county
Mar. 31, 2021
county
Gas Utility | MARYLAND    
Business Acquisition [Line Items]    
Number of counties of operation | county   1
Mountaineer | Pending    
Business Acquisition [Line Items]    
Number of counties of operation | county 50  
Enterprise value | $ $ 540  
Assumption of debt | $ $ 140  
Customers served | Customer 215