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Business Combination - Schedule of Fair Value of Purchase Consideration from Business Combination (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Mar. 31, 2018
SG Safety Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Cash and cash equivalents	₩ 28,000
Settled receivables	(456)
Total	27,544	₩ 27,570
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Cash and cash equivalents	6,283
Fair value of equity instruments previously held	1,877
Total	8,160
KTMOS Nambu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Cash and cash equivalents	4,765
Fair value of equity instruments previously held	1,545
Total	6,310
CJ Digital Music Co., Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Fair value of equity instruments newly issued	50,948
Total	₩ 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 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
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-Number 3
-IssueDate 2018-01-01
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- Definition

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- Definition

The fair value of receivables acquired in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 3
-IssueDate 2018-01-01
-Paragraph B64
-Subparagraph h
-Clause i
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- Definition

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