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

Share capital - issued share capital of Arqit Limited (Details)

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Share capital - issued share capital of Arqit Limited (Details) - USD ($)
$ / shares in Units, $ in Thousands
Sep. 02, 2021
Sep. 30, 2022
Sep. 30, 2021
Apr. 26, 2021
Apr. 25, 2021
Disclosure of classes of share capital [line items]          
Number of ordinary shares 12,973,270 121,926,166 110,073,430 1  
Par value per share $ 0.0001 $ 0.0001 $ 0.0001   $ 1
Increase in share premium $ 70,999        
Private placement          
Disclosure of classes of share capital [line items]          
Number of ordinary shares 7,100,000