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Material accounting policies - Narrative (Details) - USD ($)
12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Going concern [Abstract]        
Loss after income tax $ (28,955,000) $ (171,871,000) $ (419,770,000)  
Cash flows from (used in) operating activities (130,870,000) (72,378,000) (37,480,000)  
Current assets (liabilities) 401,389,000 65,229,000    
Assets (liabilities)   305,361,000    
Proceeds from sale of Bitcoin mined (restated) 183,586,000 78,423,000 59,037,000  
Equity 1,097,351,000 305,361,000 437,362,000 $ (49,454,000)
Bitcoin on hand 0 0    
Adjustments        
Going concern [Abstract]        
Cash flows from (used in) operating activities (183,586,000) (78,423,000) (59,037,000)  
Proceeds from sale of Bitcoin mined (restated) $ 183,586,000 $ 78,423,000 $ 59,037,000