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Cover Page - USD ($)
 12 Months Ended
Jun. 30, 2025
Sep. 17, 2025
Dec. 31, 2024
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-39267    
Entity Registrant Name Benitec Biopharma Inc.    
Entity Tax Identification Number 84-4620206    
Document Period End Date Jun. 30, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001808898    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 3940 Trust Way    
Entity Address, City or Town Hayward    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94545    
City Area Code 510    
Local Phone Number 780-0819    
Title of 12(b) Security Common Stock, par value $0.0001    
Trading Symbol BNTC    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   26,250,469  
Entity Public Float     $ 152,964,292
Amendment Description Benitec Biopharma Inc. is filing this Amendment No. 1 (this “Form 10-K/A”) to its Annual Report on Form 10-K for the fiscal year ended June 30, 2025 (the “Original 10-K”), as originally filed with the Securities and Exchange Commission (the “Commission”) on September 22, 2025, for the purpose of including the conformed signature of Baker Tilly US, LLP on the Report of Independent Registered Public Accounting Firm (the “Report”) within Item 8 of the Original 10-K. The conformed signature was inadvertently omitted from the version of the Report that was filed with the Original 10-K. This Form 10-K/A includes the Report with the conformed signature. The exhibit list appearing in Item 15 of the Form 10-K has been updated to indicate that Exhibits 21.1 and 97 were previously filed. This Form 10-K/A includes new certifications, as required by Rule 12b-15 under the Securities Exchange Act of 1934, from our Chief Executive Officer and Chief Financial Officer, dated as of the date of filing of this Form 10-K/A, and a new Consent of Independent Registered Public Accounting Firm, dated as of the date of filing of this Form 10-K/A. Except for the correction described above, this Form 10-K/A does not purport to update any disclosures contained in the annual report. For disclosures subsequent to September 22, 2025, please see the Company’s reports filed with the Commission after that date.      
Document Financial Statement Error Correction [Flag] false    
ICFR Auditor Attestation Flag false    
Auditor Name Baker Tilly    
Auditor Firm ID 23    
Auditor Location San Diego, California