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

Document and Entity Information

v3.22.2.2
Document and Entity Information
 12 Months Ended
Sep. 30, 2022
shares
Statements [Line Items]  
Entity Registrant Name Arqit Quantum Inc.
Entity Central Index Key 0001859690
Document Type 20-F
Document Period End Date Sep. 30, 2022
Amendment Flag false
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-40777
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One Nova North
Entity Address, Address Line Two 7 Floor
Entity Address, Address Line Three 11 Bressenden Place
Entity Address, City or Town London
Entity Address, Postal Zip Code SW1E 5BY
Entity Address, Country GB
Current Fiscal Year End Date --09-30
Entity Emerging Growth Company true
Entity Ex Transition Period false
ICFR Auditor Attestation Flag false
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
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Document Fiscal Year Focus 2022
Document Fiscal Period Focus FY
Auditor Name PKF Littlejohn LLP
Auditor Firm ID 2814
Auditor Location London, England
Business Contact [Member]  
Statements [Line Items]  
Contact Personnel Name David Williams
Entity Address, Address Line One Nova North
Entity Address, Address Line Two 7 Floor
Entity Address, Address Line Three 11 Bressenden Place
Entity Address, City or Town London
Entity Address, Postal Zip Code SW1E 5BY
Entity Address, Country GB
City Area Code +44
Local Phone Number 203 91 70155
Ordinary shares  
Statements [Line Items]  
Title of 12(b) Security Ordinary shares
Trading Symbol ARQQ
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 121,926,166
Warrants  
Statements [Line Items]  
Title of 12(b) Security Warrants
Trading Symbol ARQQW
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 13,038,904