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Stock-based compensation - Schedule of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Number of shares    
Outstanding, beginning balance (in shares) 7,878,554  
Granted (in shares) 0  
Forfeited or canceled (in shares) 0  
Exercised (in shares) (2,309,065)  
Outstanding, ending balance (in shares) 5,569,489 7,878,554
Vested and exercisable (in shares) 691,336  
Weighted average exercise price (per share)    
Outstanding, beginning balance (in USD per share) $ 47.07  
Granted (in USD per share) 0  
Forfeited or canceled (in USD per share) 0  
Exercised (in USD per share) 3.17  
Outstanding, ending balance (in USD per share) 65.25 $ 47.07
Vested and exercisable (in USD per share) $ 3.60  
Aggregate Intrinsic Value and Weighted Average Remaining Contractual Term [Abstract]    
Options outstanding, aggregate intrinsic value $ 32,681 $ 34,648
Options vested and exercisable, aggregate instrinsic value $ 30,156  
Options outstanding, weighted average remaining contractual term 7 years 6 months 10 days 5 years 9 months 18 days
Options vested and exercisable, weighted average remaining contractual term 4 years 7 months 24 days