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Contingent consideration 1 - Additional Information (Detail)
 6 Months Ended
Dec. 31, 2023
AUD ($)
Milestone
Dec. 31, 2023
EUR (€)
Milestone
Jun. 30, 2023
Disclosure of contingent liabilities [line items]      
Milestone payments not booked $ 486,167,287 € 300,500,000  
Milestone payment discount rate 7.00% 7.00% 20.00%
Milestone Two [member]      
Disclosure of contingent liabilities [line items]      
Contingent consideration | $ $ 1,250,000    
Glioblast Pty Ltd [member]      
Disclosure of contingent liabilities [line items]      
Number of contingent milestone payments | Milestone 4 4  
Contingent consideration – EVT801 [Member]      
Disclosure of contingent liabilities [line items]      
Percentage of discount rate on milestone payments 7.00% 7.00% 7.00%
Contingent consideration – EVT801 [Member] | Milestone Three [Member]      
Disclosure of contingent liabilities [line items]      
Probability of milestone payments 100.00% 100.00% 100.00%
Contingent consideration – EVT801 [Member] | Milestone Four [member]      
Disclosure of contingent liabilities [line items]      
Probability of milestone payments 80.00% 80.00% 63.00%
Contingent consideration – EVT801 [Member] | Milestone Five [member]      
Disclosure of contingent liabilities [line items]      
Probability of milestone payments 63.00% 63.00% 63.00%