Group information - Additional Information (Detail)		6 Months Ended
Aug. 18, 2026	Jun. 30, 2026
Disclosure of non-adjusting events after reporting period [line items]
Date of end of reporting period		Jun. 30, 2026
Authorization Of Financial Statements [Member]
Disclosure of non-adjusting events after reporting period [line items]
Date of authorisation for issue of financial statements	Aug. 18, 2026

The date on which financial statements are authorised for issue.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 10
-IssueDate 2025-01-01
-Paragraph 17
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=10&code=ifrs-tx-2025-en-r&anchor=para_17&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 188
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_188&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 188
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_188&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_DateOfAuthorisationForIssueOfFinancialStatements2013
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration