XML 104 R92.htm IDEA: XBRL DOCUMENT v3.19.1

Significant Accounting Policies - Additional Information (Detail) ₩ in Millions	12 Months Ended
	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

X

- 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

Name:	ifrs-full_UsefulLivesOrDepreciationRatesInvestmentPropertyCostModel
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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