v3.26.1
Document and Entity Information
6 Months Ended
Mar. 31, 2026
Document and Entity Information  
Entity Registrant Name Arqit Quantum Inc.
Entity Central Index Key 0001859690
Document Type 6-K
Document Period End Date Mar. 31, 2026
Amendment Flag false
Current Fiscal Year End Date --09-30
Document Fiscal Year Focus 2026
Document Fiscal Period Focus Q2