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Mining hardware prepayments (Details)
 12 Months Ended
Aug. 01, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Agreement
BusinessDay
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Non-current assets [abstract]          
Mining hardware prepayments     $ 158,184,000 $ 75,129,000 $ 0
Mining Hardware Prepayments [Abstract]          
Operating capacity hash rate     6.0    
Remaining mining hardware prepayments     $ 83,340,000    
First Two Purchase Agreement with Bitmain [Member]          
Mining Hardware Prepayments [Abstract]          
Operating capacity hash rate     4.3    
Third Purchase Agreement with Bitmain [Member]          
Mining Hardware Prepayments [Abstract]          
Operating capacity hash rate     10    
Third Purchase Agreement with Bitmain [Member] | Subsequent Events [Member]          
Mining Hardware Prepayments [Abstract]          
Operating capacity hash rate 6.0        
Additional operating capacity hash rate 1.7        
Mining Hardware [Member]          
Non-current assets [abstract]          
Mining hardware prepayments     $ 158,184,000    
Mining Hardware Prepayments [Abstract]          
Number of binding hardware purchase agreements | Agreement     3    
Operating capacity hash rate     4.3    
Remaining mining hardware prepayments     $ 83,340,000    
Mining Hardware [Member] | Forecast [Member]          
Non-current assets [abstract]          
Mining hardware prepayments   $ 76,133,000      
Mining Hardware Prepayments [Abstract]          
Operating capacity hash rate   6.0      
Mining Hardware [Member] | Subsequent Events [Member]          
Mining Hardware Prepayments [Abstract]          
Operating capacity hash rate 6.0        
Remaining mining hardware prepayments $ 82,051,000        
Mining Hardware [Member] | First Two Purchase Agreement with Bitmain [Member]          
Mining Hardware Prepayments [Abstract]          
Operating capacity hash rate     4.3    
Mining Hardware [Member] | Third Purchase Agreement with Bitmain [Member]          
Mining Hardware Prepayments [Abstract]          
Operating capacity hash rate     10    
Hardware purchase agreement     $ 400,000,000    
Percentage of purchase price     25.00%    
Percentage of purchase price liable for reasonable, non-penalty liquidated damages     20.00%    
Mining Hardware [Member] | Third Purchase Agreement with Bitmain [Member] | Minimum [Member]          
Mining Hardware Prepayments [Abstract]          
Number of business days prior to the relevant deadline | BusinessDay     5    
Mining Hardware [Member] | Third Purchase Agreement with Bitmain [Member] | Subsequent Events [Member]          
Mining Hardware Prepayments [Abstract]          
Operating capacity hash rate 6.0        
Additional operating capacity hash rate 1.7