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Significant accounting policies, Going Concern (Details)
 12 Months Ended
Aug. 01, 2022
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Going concern [Abstract]        
Loss after income tax   $ (419,770,000) $ (60,390,000) $ (2,142,000)
Net operating cash inflows   21,557,000 1,761,000 (987,000)
Net current assets (liabilities)   75,148,000 (130,034,000)  
Net assets (liabilities)   437,362,000 (49,454,000)  
Mining hardware prepayments   $ 158,184,000 75,129,000 0
Operating capacity hash rate   6.0    
Cash on hand utilized for mining assets   $ 210,593,000 $ 73,815,000 $ 0
Remaining mining hardware prepayments   $ 83,340,000    
Minimum [Member]        
Going concern [Abstract]        
Period to adequate cash reserves to enable to meet its obligations from date of approval   1 year    
Mining Hardware [Member]        
Going concern [Abstract]        
Mining hardware prepayments   $ 158,184,000    
Prepayments balance relates to operating capacity   $ 30,127,000    
Operating capacity hash rate   4.3    
Amount of prepayments utilized   $ 46,006,000    
Cash amount of prepayments   46,670,000    
Cash on hand utilized for mining assets   5,900,000    
Remaining mining hardware prepayments   $ 83,340,000    
Mining Hardware [Member] | Subsequent Events [Member]        
Going concern [Abstract]        
Operating capacity hash rate 6.0      
Additional operating capacity hash rate 1.7      
Cash on hand utilized for mining assets $ 5,869,000      
Remaining mining hardware prepayments $ 82,051,000