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Material accounting policies - Additional Information (Detail)
$ in Thousands
 4 Months Ended 12 Months Ended
May 12, 2025
AUD ($)
Apr. 01, 2025
Jan. 14, 2025
USD ($)
Oct. 28, 2024
Sep. 04, 2024
USD ($)
Oct. 31, 2025
USD ($)
Jun. 30, 2025
AUD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
AUD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
AUD ($)
Jul. 25, 2025
Jun. 30, 2025
USD ($)
Jan. 01, 2025
AUD ($)
Jul. 11, 2024
Jun. 30, 2022
AUD ($)
May 01, 2022
Apr. 22, 2022
USD ($)
Disclosure of summary of significant accounting policies [line items]                                    
Consolidated loss after income tax             $ 20,702   $ 26,778   $ 20,465              
Net current liability position             9,100                      
Net cash outflows from operating activities             13,300                      
Consolidated cash in hand and at bank             4,345   1,657   5,241         $ 7,361    
Aggregate offering                         $ 35,000,000          
Number of shares represented by one depositary receipt     100                       11,000,000   500  
Proceeds from the issuance of common stock     $ 1,860,000                              
Proceeds from issuing shares             11,770   2,914   12,972              
Increase of aggregate offering price         $ 50,000,000                          
Minimum threshold limit of market value $ 35,000                                  
Description of transactions after reporting period that significantly change number of ordinary shares outstanding   On 1 April 2025, the Company changed its ratio of its ADSs to ordinary shares from one ADS representing 100 ordinary shares to one ADS representing 500 ordinary shares.   On 28 October 2024, the Company changed its ratio of ADSs ordinary shares from one ADS representing 10 ordinary shares to one ADS representing 100 ordinary shares.                            
Intangible assets other than goodwill             $ 1,087   $ 15,400   $ 17,269     $ 0        
Amount of refundable tax offset                         $ 20,000,000          
Private Placement of Equity Securities [Member]                                    
Disclosure of summary of significant accounting policies [line items]                                    
Proceeds from the issuance of common stock           $ 2,049,992,000                        
At The Market Equity Program [Member]                                    
Disclosure of summary of significant accounting policies [line items]                                    
Aggregate offering                                   $ 35,000,000
Proceeds from the issuance of common stock           $ 1,441,826,000                        
Proceeds from issuing shares               $ 4,556,252,000   $ 1,656,016,000                
Remaining capacity of ATM facility               $ 36,630,000                    
American Depository Shares [member] | At The Market Equity Program [Member]                                    
Disclosure of summary of significant accounting policies [line items]                                    
Number of shares represented by one depositary receipt                       500           500
Licensing agreement for paxalisib [member]                                    
Disclosure of summary of significant accounting policies [line items]                                    
Remaining useful life,licensing agreement             15 years 15 years                    
Licensing agreement for EVT801 [member]                                    
Disclosure of summary of significant accounting policies [line items]                                    
Remaining useful life,licensing agreement             12.5 years 12.5 years