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

Fixed asset investments - Subsidiaries (Details)

v3.21.2
Fixed asset investments - Subsidiaries (Details)
12 Months Ended
Sep. 30, 2021
Arqit Limited  
Disclosure of joint ventures [line items]  
Percentage of ownership interest in subsidiary 100.00%
Arqit Inc.  
Disclosure of joint ventures [line items]  
Percentage of ownership interest in subsidiary 100.00%
Arqit LLC  
Disclosure of joint ventures [line items]  
Percentage of ownership interest in subsidiary 100.00%