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Key management personnel disclosures - Directors and Key Management (Details)
 12 Months Ended
Aug. 18, 2021
miner
$ / shares
shares
Jun. 30, 2024
Class B Shares    
Significant transactions with key management personnel [Abstract]    
Number of holder votes | miner 15  
Number of years company's ordinary shares are first listed on a recognized stock exchange   12 years
Entities Controlled by Daniel Roberts | Class B Shares    
Significant transactions with key management personnel [Abstract]    
Shares issued (in shares) | shares 1  
Share price (in dollars per share) | $ / shares $ 1.00  
Entities Controlled by William Roberts | Class B Shares    
Significant transactions with key management personnel [Abstract]    
Shares issued (in shares) | shares 1  
Share price (in dollars per share) | $ / shares $ 1.00  
Daniel Roberts | Directors [Member]    
Directors and key management personnel [Abstract]    
Date of Commencement   Nov. 06, 2018
William Roberts | Directors [Member]    
Directors and key management personnel [Abstract]    
Date of Commencement   Nov. 06, 2018
David Bartholomew [Member] | Directors [Member]    
Directors and key management personnel [Abstract]    
Date of Commencement   Sep. 24, 2021
Christopher Guzowski [Member] | Directors [Member]    
Directors and key management personnel [Abstract]    
Date of Commencement   Dec. 19, 2019
Michael Alfred [Member] | Directors [Member]    
Directors and key management personnel [Abstract]    
Date of Commencement   Oct. 21, 2021
Sunita Parasuraman [Member] | Directors [Member]    
Directors and key management personnel [Abstract]    
Date of Commencement   Jul. 17, 2023
David Shaw [Member] | Key Management Personnel    
Directors and key management personnel [Abstract]    
Date of Commencement   Oct. 22, 2021
Belinda Nucifora [Member] | Key Management Personnel    
Directors and key management personnel [Abstract]    
Date of Commencement   May 16, 2022
Cesilia Kim [Member] | Key Management Personnel    
Directors and key management personnel [Abstract]    
Date of Commencement   Jan. 01, 2023