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Business Combination - Schedule of Cash Outflows as a Result of Acquisition (Detail) ₩ in Millions	Dec. 31, 2018 KRW (₩)
SG Safety Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Purchase consideration Cash	₩ 28,000
Total	28,000
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Purchase consideration Cash	6,283
Less : Recognized amounts of cash and cash equivalents	7,864
Total	(1,581)
KTMOS Nambu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Purchase consideration Cash	4,765
Less : Recognized amounts of cash and cash equivalents	3,340
Total	1,425
CJ Digital Music Co., Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Less : Recognized amounts of cash and cash equivalents	1,556
Total	₩ (1,556)

X

- Definition

The amount recognised as of the acquisition date for cash and cash equivalents acquired in a business combination. [Refer: Cash and cash equivalents; Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 3
-IssueDate 2018-01-01
-Paragraph B64
-Subparagraph i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_i&doctype=Appendix&seq=2
-URIDate 2018-03-16

+ Details

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X

- Definition

The fair value, at acquisition date, of cash transferred as consideration 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
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_f_i&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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X

- Definition

Cash consideration net of cash acquired.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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- Details

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