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Commitments - Other (Details)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 08, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
HEC Agreement      
Commitments      
Commitment amount     $ 32.0
Development costs   $ 4.5  
Excess development cost split ratio     1
HEC Agreement | First ten years      
Commitments      
Profit split ratio     1
Profit split period     10 years
HEC Agreement | Next five years      
Commitments      
Profit split ratio     1.50
Profit split period     5 years
Sunshine Agreement      
Commitments      
Commitment amount $ 32.0    
Sunshine Agreement | First ten years      
Commitments      
Profit split ratio 1    
Profit split period 10 years    
Sunshine Agreement | Next five years      
Commitments      
Profit split ratio 1.50    
Profit split period 5 years