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v3.25.1

General Information - Additional Information (Detail) - shares | Jul. 02, 2001 | May 29, 1999
--- | --- | ---
Disclosure of general information [line items] |  |
Number of additional shares issued | 55,502,161 | 24,282,195
Government Owned shares [member] |  |
Disclosure of general information [line items] |  |
Number of additional shares issued |  | 20,813,311

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- Definition The increase (decrease) in the number of ordinary shares issued. [Refer: Ordinary shares [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Line item represents disclosure of general information. + References No definition available. + Details
Name: | kt_DisclosureOfGeneralInformationLineItems
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | kt_ClassOfInstrumentAxis=kt_GovernmentOwnedSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |