v3.26.3
Share Capital, Share Issues (Details)
$ in Millions
12 Months Ended
May 18, 2026
$ / shares
shares
May 18, 2026
USD ($)
shares
May 18, 2025
$ / shares
May 18, 2025
USD ($)
Jun. 30, 2026
USD ($)
shares
Sep. 09, 2025
shares
Sep. 04, 2025
shares
Sep. 01, 2025
shares
Aug. 30, 2025
shares
Jun. 30, 2025
shares
Nov. 18, 2024
shares
Jun. 30, 2024
shares
Jun. 30, 2023
shares
Ordinary Shares [Member]                          
Share issues [abstract]                          
Issuance of fully paid ordinary shares (in shares)         194,016,029         11,543,296,014   10,293,296,014 10,039,138,024
Number of ordinary shares issued from other issuances and option exercises (in shares)         255,830                
Ordinary Shares [Member] | Non-underwritten Share Purchase Plan [Member]                          
Share issues [abstract]                          
Share issued price (in dollars per share) | $ / shares     $ 12.2                    
Gross proceeds from issuance of shares | $       $ 11.1                  
Ordinary Shares [Member] | Resource Capital Fund VIII L.P. [Member]                          
Share issues [abstract]                          
Issuance of fully paid ordinary shares (in shares)             2,156,250,000            
Share issued price (in dollars per share) | $ / shares $ 0.032                        
Gross proceeds from issuance of shares | $   $ 45.2                      
Ordinary Shares [Member] | Institutional investors [Member]                          
Share issues [abstract]                          
Issuance of fully paid ordinary shares (in shares) 22,540,984 22,540,984                      
Share issued price (in dollars per share) | $ / shares $ 12.2                        
Gross proceeds from issuance of shares | $   $ 196.0                      
Piedmont Lithium Inc [Member]                          
Share issues [abstract]                          
Percentage of issued capital acquired                     100.00%    
Piedmont Lithium Inc [Member] | Ordinary Shares [Member]                          
Share issues [abstract]                          
Number of shares issued (in shares)           97,500   11,565,504,804          
Sayona Mining Limited [Member]                          
Share issues [abstract]                          
Number of shares issued (in shares) [1]                 11,565,602,304        
Sayona Mining Limited [Member] | Ordinary Shares [Member]                          
Share issues [abstract]                          
Number of shares issued (in shares)                     11,565,602,304    
Gross proceeds from other share issuances and option exercises | $         $ 1.6                
Sayona Mining Limited [Member] | Ordinary Shares [Member] | Non-underwritten Share Purchase Plan [Member]                          
Share issues [abstract]                          
Issuance of fully paid ordinary shares (in shares) 1,275,668 1,275,668                      
[1] Amount may not reconcile as individual shareholdings have been rounded up to the nearest share on conversion of Piedmont common stock to ordinary fully paid shares in Sayona Mining Limited.