Business Combination - Additional information (Parenthetical) (Detail) - SK Infosec Co., Ltd. [member] ₩ in Millions	Oct. 01, 2018 KRW (₩) shares
Disclosure of detailed information about business combination [line items]
Number of treasury shares transferred as consideration \| shares	1,260,668
Fair value of total consideration transferred \| ₩	₩ 335,338

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2018-01-01
-Paragraph B64
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_f&doctype=Appendix&seq=2
-URIDate 2018-03-16

Name:	ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant