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Assets Held for Sale - Additional Information (Detail) ₩ in Millions | Dec. 31, 2018 KRW (₩)
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Disclosure Of Assets Held For Sale [abstract] |
Assets held for sale | ₩ 13,035

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- Definition The amount of non-current assets or disposal groups classified as held for sale. [Refer: Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2018-01-01 -Paragraph 38 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2018-03-01&anchor=para_38&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of assets held for sale. + References No definition available. + Details
Name: | kt_DisclosureOfAssetsHeldForSaleAbstract
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration