Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Related party transactions (Details)

v3.21.2
Related party transactions (Details)
 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Aug. 20, 2021
GBP (£)
Disclosure of transactions between related parties [line items]        
Borrowings interest rate 8.00% 8.00%    
Arqit PTE        
Disclosure of transactions between related parties [line items]        
Amount paid to related party   $ 11,679 $ 7,982  
Arqit PTE | David Williams        
Disclosure of transactions between related parties [line items]        
Percentage of ownership interest held   50    
Amount receivable     20,673  
Related party transaction loans | £       £ 2,000,000
Borrowings interest rate       8.00%
Interest paid on borrowings $ 14,401      
Fee charged on borrowings 88,800      
Arqit PTE | David Bestwick        
Disclosure of transactions between related parties [line items]        
Percentage of ownership interest held   50    
Related party transaction loans | £       £ 2,000,000
Borrowings interest rate       8.00%
Interest paid on borrowings 14,401      
Fee charged on borrowings $ 88,800      
Arqit PTE | Lt General VL Jamieson        
Disclosure of transactions between related parties [line items]        
Amount paid to Director   $ 103,861 0  
Arqit PTE | General S Wilson        
Disclosure of transactions between related parties [line items]        
Amount paid to Director   $ 73,398 $ 0