v3.26.1
Earnings per share (Details)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2025
$ / shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2025
$ / shares
Earnings per share [Abstract]        
Loss after income tax attributable to the owners of ioneer Limited | $ $ (4,070)   $ (9,554)  
Weighted average number of ordinary shares used as the denominator [Abstract]        
Issued ordinary shares - opening balance (in shares) 2,357,575,511   2,325,614,708  
Effect of shares issued (in shares) 56,390,855   31,960,803  
Weighted average number of ordinary shares (in shares) 2,413,966,366   2,357,575,511  
Effect of dilution from options and rights on issue (in shares) 0   0  
Weighted average number of ordinary shares for basic EPS (in shares) 2,413,966,366   2,357,575,511  
Basic earnings per share (in dollars per share) | (per share) $ (0.17) $ (0.17) $ (0.41) $ (0.41)
Diluted earnings per share (in dollars per share) | (per share) $ (0.17) $ (0.17) $ (0.41) $ (0.41)
Effect of dilution from options and rights (in shares) 76,665,575   64,922,144