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Business Combination - Schedule of Fair Value of Purchase Consideration from Business Combination (Parenthetical) (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2018 KRW (₩) shares
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Number of ordinary shares previously held | shares	93,994
KTMOS Nambu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Number of ordinary shares previously held | shares	65,831
GENIE Music Corporation K T Music Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Fair value of equity instruments newly issued | ₩	₩ 50,948
Number of ordinary shares issued	8,992,685
Share issuance cost | ₩	₩ 31

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- 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.

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- Definition

The number of instruments or interests issued or issuable at acquisition date for equity interests of the acquirer transferred as consideration 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 f
-Clause iv
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- Definition

The amount of cost related to the issuance of shares.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard
-URIDate 2018-03-16

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Acquisition date fair value of equity instruments newly issued.

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Number of ordinary shares previously held.

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