Income tax expense - Current tax assets and liabilities (Details) $ in Thousands, ₩ in Millions	Dec. 31, 2025 KRW (₩)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 KRW (₩)
Disclosure Of Current Tax Assets Liabilities [Abstract]
Current tax assets	₩ 228,229	$ 157,994	₩ 61,613
Current tax liabilities	₩ 723,368	$ 500,757	₩ 127,126

The excess of amount paid for current tax in respect of current and prior periods over the amount due for those periods. Current tax is the amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 54
-Subparagraph n
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_n&doctype=Standard
-URIDate 2025-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant