Business combination agreement - Deemed cost (Details) - Arqit Quantum Inc	Sep. 03, 2021 USD ($)
Disclosure of detailed information about business combination [line items]
Expense recognised for difference between deemed cost and fair value of net assets acquired	$ 55,459,939
Share issuance costs	$ 16,914,223

The amount of cost related to the issuance of shares.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 106
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_ShareIssueRelatedCost
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration