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Share-based payments - Summary of share-based payments (Detail)
 12 Months Ended
Oct. 27, 2025
Jun. 30, 2025
Shares
$ / shares
Jun. 30, 2025
Shares
$ / shares
$ / shares
Jun. 30, 2024
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Balance at the start of the year, share options   10,180,000 10,180,000  
Granted, share options | Shares   6,000 6,000  
Expired / lapsed on termination of employment   (2,100,000) (2,100,000) (4,600,000)
Balance at the end of the year, share options   8,080,000 8,080,000 10,180,000
Balance at the start of the year, Weighted average exercise price   $ 0.72   $ 0.63
Granted, Weighted average exercise price   0   0
Exercised, Weighted average exercise price   0   0
Expired, Weighted average exercise price   1.07   0.43
Balance at the end of the year, Weighted average exercise price   $ 0.63   $ 0.72
Ordinary shares [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Balance at the start of the year, share options   10,180,000 10,180,000 14,780,000
Forfeited, share options   (25,000) (25,000) (3,400,000)
Expired / lapsed on termination of employment   (2,075,000) (2,075,000) (1,200,000)
Balance at the end of the year, share options   8,080,000 8,080,000 10,180,000
Exercisable at the end of the financial year, share option   7,805,000 7,805,000 7,290,000
Balance at the start of the year, Weighted average exercise price   $ 0.72   $ 0.63
Forfeited, Weighted average exercise price   0.94   0.42
Expired, Weighted average exercise price   1.08   0.49
Balance at the end of the year, Weighted average exercise price   0.63   0.72
Exercisable at the end of the financial year, Weighted average exercise price   $ 0.65 $ 0.65 $ 0.84
American Depository Shares [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Balance at the start of the year, share options   52,000 52,000 0
Granted, share options   33,467 33,467 57,000
Forfeited, share options   0 0 (5,000)
Balance at the end of the year, share options   85,467 85,467 52,000
Exercisable at the end of the financial year, share option   50,217 50,217 0
Balance at the start of the year, Weighted average exercise price   $ 27.9   $ 0
Granted, Weighted average exercise price   37.35   28
Forfeited, Weighted average exercise price   0   28.8
Expired, Weighted average exercise price   0    
Balance at the end of the year, Weighted average exercise price   30.08   27.9
Exercisable at the end of the financial year, Weighted average exercise price   $ 31.83 $ 31.83 $ 0
Tranche 3 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date       13/11/2019
Expiry date       Jan. 04, 2024
Exercise price       $ 0.49
Balance at the start of the year, share options   0 0 1,200,000
Expired / lapsed on termination of employment       (1,200,000)
Balance at the end of the year, share options       0
Tranche 4 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   13/01/2020 13/01/2020 13/01/2020
Expiry date   Jan. 13, 2025 Jan. 13, 2025 Jan. 13, 2025
Exercise price   $ 0.88   $ 0.88
Balance at the start of the year, share options   137,500 137,500 187,500
Expired / lapsed on termination of employment   (137,500) (137,500) (50,000)
Balance at the end of the year, share options   0 0 137,500
Tranche 5 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   09/11/2020 09/11/2020 09/11/2020
Expiry date   Nov. 09, 2024 Nov. 09, 2024 Nov. 09, 2024
Exercise price   $ 1.13   $ 1.13
Balance at the start of the year, share options   1,200,000 1,200,000 1,200,000
Expired / lapsed on termination of employment   (1,200,000) (1,200,000)  
Balance at the end of the year, share options   0 0 1,200,000
Tranche 6 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   09/11/2020 09/11/2020 09/11/2020
Expiry date   Jan. 13, 2025 Jan. 13, 2025 Jan. 13, 2025
Exercise price   $ 0.88   $ 0.88
Balance at the start of the year, share options   600,000 600,000 600,000
Expired / lapsed on termination of employment   (600,000) (600,000)  
Balance at the end of the year, share options   0 0 600,000
Tranche 7 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   04/01/2021 04/01/2021 04/01/2021
Expiry date   Jan. 04, 2025 Jan. 04, 2025 Jan. 04, 2025
Exercise price   $ 1.69   $ 1.69
Balance at the start of the year, share options   137,500 137,500 187,500
Expired / lapsed on termination of employment   (137,500) (137,500) (50,000)
Balance at the end of the year, share options   0 0 137,500
Tranche 8 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   09/09/2021 09/09/2021 09/09/2021
Expiry date   Jun. 26, 2026 Jun. 26, 2026 Jun. 26, 2026
Exercise price   $ 1.37   $ 1.37
Balance at the start of the year, share options   100,000 100,000 100,000
Balance at the end of the year, share options   100,000 100,000 100,000
Tranche 9 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   16/11/2021 16/11/2021 16/11/2021
Expiry date   Nov. 16, 2025 Nov. 16, 2025 Nov. 16, 2025
Exercise price   $ 1.69   $ 1.69
Balance at the start of the year, share options   750,000 750,000 750,000
Balance at the end of the year, share options   750,000 750,000 750,000
Tranche 10 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   16/11/2021 16/11/2021 16/11/2021
Expiry date   Nov. 16, 2025 Nov. 16, 2025 Nov. 16, 2025
Exercise price   $ 2.24   $ 2.24
Balance at the start of the year, share options   500,000 500,000 500,000
Balance at the end of the year, share options   500,000 500,000 500,000
Tranche 11 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   16/11/2021 16/11/2021 16/11/2021
Expiry date   Nov. 16, 2025 Nov. 16, 2025 Nov. 16, 2025
Exercise price   $ 1.56   $ 1.56
Balance at the start of the year, share options   800,000 800,000 800,000
Balance at the end of the year, share options   800,000 800,000 800,000
Tranche 12 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date       01/02/2022
Expiry date       Feb. 01, 2027
Exercise price       $ 0.94
Balance at the start of the year, share options   0 0 800,000
Expired / lapsed on termination of employment       (800,000)
Balance at the end of the year, share options       0
Tranche 13 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   01/02/2022 01/02/2022 01/02/2022
Expiry date   Feb. 01, 2027 Feb. 01, 2027 Feb. 01, 2027
Exercise price   $ 0.94   $ 0.94
Balance at the start of the year, share options   325,000 325,000 425,000
Forfeited, share options (25,000)      
Expired / lapsed on termination of employment   (25,000) (25,000) (100,000)
Balance at the end of the year, share options   300,000 300,000 325,000
Tranche 14 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   24/05/2022 24/05/2022 24/05/2022
Expiry date   May 24, 2027 May 24, 2027 May 24, 2027
Exercise price   $ 0.78   $ 0.78
Balance at the start of the year, share options   100,000 100,000 100,000
Balance at the end of the year, share options   100,000 100,000 100,000
Tranche 15 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   03/03/2023 03/03/2023 03/03/2023
Expiry date   Mar. 03, 2027 Mar. 03, 2027 Mar. 03, 2027
Exercise price   $ 0.15   $ 0.15
Balance at the start of the year, share options   2,530,000 2,530,000 3,930,000
Granted, share options       0
Expired / lapsed on termination of employment   0 0 (1,400,000)
Balance at the end of the year, share options   2,530,000 2,530,000 2,530,000
Tranche 16 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   03/05/2023 03/05/2023 05/03/2023
Expiry date   May 03, 2027 May 03, 2027 May 03, 2027
Exercise price   $ 0.19   $ 0.19
Balance at the start of the year, share options   3,000,000 3,000,000 4,000,000
Granted, share options       0
Expired / lapsed on termination of employment   0 0 (1,000,000)
Balance at the end of the year, share options   3,000,000 3,000,000 3,000,000
Tranche 17 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   22/04/2024 22/04/2024  
Expiry date   Apr. 22, 2029 Apr. 22, 2029  
Exercise price   $ 0.59    
Balance at the start of the year, share options       14,780,000
Tranche 17 [member] | American Depository Shares [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   22/04/2024 22/04/2024  
Expiry date   Apr. 22, 2029 Apr. 22, 2029  
Exercise price   $ 29.3    
Balance at the start of the year, share options   30,000 30,000  
Granted, share options   0 0  
Balance at the end of the year, share options   30,000 30,000 30,000
Tranche 18 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   17/06/2024 17/06/2024  
Expiry date   Jun. 17, 2029 Jun. 17, 2029  
Exercise price   $ 0.58    
Tranche 18 [member] | American Depository Shares [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   17/06/2024 17/06/2024  
Expiry date   Jun. 17, 2029 Jun. 17, 2029  
Exercise price   $ 25.65    
Balance at the start of the year, share options   17,000 17,000  
Granted, share options   0 0  
Expired / lapsed on termination of employment   0 0  
Balance at the end of the year, share options   17,000 17,000 17,000
Tranche 19 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   27/06/2024 27/06/2024  
Expiry date   Jun. 27, 2030 Jun. 27, 2030  
Exercise price   $ 0.33    
Tranche 19 [member] | American Depository Shares [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   27/06/2024 27/06/2024  
Expiry date   Jun. 27, 2030 Jun. 27, 2030  
Exercise price   $ 14.85    
Balance at the start of the year, share options   5,000 5,000  
Granted, share options   0 0  
Balance at the end of the year, share options   5,000 5,000 5,000
Tranche 20 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   11/09/2024 11/09/2024  
Expiry date   Sep. 11, 2029 Sep. 11, 2029  
Exercise price   $ 0.5    
Tranche 20 [member] | American Depository Shares [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   11/09/2024 11/09/2024  
Expiry date   Sep. 11, 2029 Sep. 11, 2029  
Exercise price     $ 24.8  
Granted, share options   6,000 6,000  
Balance at the end of the year, share options   6,000 6,000  
Tranche 21-22 [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   14/01/2025 14/01/2025  
Expiry date   Jul. 14, 2030 Jul. 14, 2030  
Exercise price   $ 1.5    
Tranche 21-22 [member] | American Depository Shares [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Grant date   14/01/2025 14/01/2025  
Expiry date   Jul. 14, 2030 Jul. 14, 2030  
Exercise price     $ 7.5  
Granted, share options   27,467 27,467  
Balance at the end of the year, share options   27,467 27,467