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Commitments and Contingencies (Details)
$ in Millions
12 Months Ended
Feb. 08, 2021
USD ($)
violation
Sep. 30, 2022
USD ($)
$ / Mcf
MMcf
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 28, 2021
civilAction
Long Term Purchase Commitment [Line Items]          
Number of alleged violations | violation 4        
Damages sought, value | $ $ 1.6        
Number of civil actions | civilAction         3
Purchases under contract | $   $ 352.6 $ 149.4 $ 58.5  
Supply Commitment          
Long Term Purchase Commitment [Line Items]          
Contract term   1 year      
Purchase commitment volume   13,200      
Supply Commitment | Weighted Average          
Long Term Purchase Commitment [Line Items]          
Fixed price contracts ( (USD per Mcf) | $ / Mcf   5.39      
Supply Commitment | Short-term Contract with Customer          
Long Term Purchase Commitment [Line Items]          
Contract term   1 year      
Purchase commitment volume   55,600      
Supply Commitment | Long-term Contract with Customer Within Two To Three Years          
Long Term Purchase Commitment [Line Items]          
Purchase commitment volume   89,100      
Supply Commitment | Long-term Contract with Customer Within Two To Three Years | Minimum          
Long Term Purchase Commitment [Line Items]          
Contract term   2 years      
Supply Commitment | Long-term Contract with Customer Within Two To Three Years | Maximum          
Long Term Purchase Commitment [Line Items]          
Contract term   3 years