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Business Combination - Summary of Business Combination (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2018
SG Safety Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Date	May 31, 2018
Purchase consideration	₩ 27,544	₩ 27,570
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Date	Sep. 30, 2018
Purchase consideration	₩ 8,160
KTMOS Nambu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Date	Sep. 30, 2018
Purchase consideration	₩ 6,310
CJ Digital Music Co., Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Date	Oct. 10, 2018
Purchase consideration	₩ 50,948

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2018-01-01
-Paragraph B64
-Subparagraph f
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-URIDate 2018-03-16

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X

- Definition

The date on which the acquirer obtains control of the acquiree in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2018-01-01
-Paragraph B64
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_b&doctype=Appendix&seq=2
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X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Details

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- Details

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