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Significant Accounting Policies - Additional Information (Detail) ₩ in Millions | 12 Months Ended
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Dec. 31, 2018 KRW (₩)
Disclosure of significant accounting policies [line items] |
Lease term | Lease term is over 12 months
Description of assets which are not low value | Underlying assets are not low value assets
Useful lives of investment property, excluding land depreciated cost model | 10 to 40 years
IFRS 16 leases [member] |
Disclosure of significant accounting policies [line items] |
Lease assets and liabilities | ₩ 616,759

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- Definition The useful lives or depreciation rates used for investment property. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_79_b&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Disclosure of significant accounting policies [line items] + References No definition available. + Details
Name: | kt_DisclosureOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease assets and liabilities recognized in consolidated financial position. + References No definition available. + Details
Name: | kt_LeaseAssetsAndLiabilitiesRecognizedInConsolidatedFinancialPosition
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Statement that lessee accounts for leases of not low-value assets using recognition exemption. + References No definition available. + Details
Name: | kt_StatementThatLesseeAccountsForLeasesOfNotLowvalueAssetsUsingRecognitionExemption
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Statement that lessee accounts for term leases using recognition exemption. + References No definition available. + Details
Name: | kt_StatementThatLesseeAccountsForTermLeasesUsingRecognitionExemption
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_EffectOfOverlayApproachReclassificationAxis=kt_IFRS16LeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |