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Equity settled share-based payments - Option activities (Details) - Share option
 6 Months Ended 12 Months Ended
Dec. 31, 2023
shares
$ / shares
Jun. 30, 2023
shares
$ / shares
Jun. 30, 2022
shares
$ / shares
Jun. 30, 2021
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options, outstanding at the beginning | shares 5,701,396 8,918,492 12,400,836 11,014,000
Number of options, granted | shares       4,703,500
Number of options, exercised | shares (427,492) (1,376,096) (1,783,180) (747,664)
Number of options, forfeited | shares (104,800) (1,841,000) (1,699,164) (2,569,000)
Number of options, outstanding at the end | shares 5,169,104 5,701,396 8,918,492 12,400,836
Number of options, exercisable at the end | shares 2,237,104 2,114,496 1,888,574 1,128,336
Number of options, non-vested at the end | shares 2,932,000 3,586,900 7,029,918 11,272,500
Weighted-average exercise price, outstanding at the beginning (in dollars per share) $ 0.036 $ 0.036 $ 0.036 $ 0.036
Weighted-average exercise price, granted (in dollars per share)       0.036
Weighted-average exercise price, exercised (in dollars per share) 0.036 0.035 0.036 0.036
Weighted-average exercise price, forfeited (in dollars per share) 0.036 0.036 0.036 0.036
Weighted-average exercise price, outstanding at the end (in dollars per share) 0.036 0.036 0.036 0.036
Weighted-average exercise price, exercisable at the end (in dollars per share) 0.036 0.036 0.036 0.036
Weighted-average exercise price, non-vested at the end (in dollars per share) 0.036 0.036 0.036 0.036
Weighted-average grant date fair value, outstanding at the beginning (in dollars per share) 3.72 3.67 3.71 3.08
Weighted-average grant date fair value, granted (in dollars per share)       4.89
Weighted-average grant date fair value, exercised (in dollars per share) 4.20 3.90 3.64 3.08
Weighted-average grant date fair value, forfeited (in dollars per share) 4.74 3.33 4.01 3.10
Weighted-average grant date fair value, outstanding at the end (in dollars per share) 3.66 3.72 3.67 3.71
Weighted-average grant date fair value, exercisable at the end (in dollars per share) 3.57 3.36 3.39 3.08
Weighted-average grant date fair value, non-vested at the end (in dollars per share) $ 3.73 $ 3.94 $ 3.74 $ 3.78