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Business Combination - Schedule of Fair Value of Assets and Liabilities Recognized as a Result of Acquisition at Acquisition Date (Detail)
₩ in Millions
Dec. 31, 2018
KRW (₩)
SG Safety Corporation [member]  
Disclosure of detailed information about business combination [Line Items]  
Recognized amounts of identifiable assets acquired ₩ 17,763
Other current assets 1,367
Property and equipment 4,047
Contractual customer relationship (included in intangibles) 10,467
Other non-currentassets 1,882
Recognized amounts of identifiable liabilities assumed 5,637
Trade and other payables 120
Borrowings 5,000
Post-employment benefit obligations 517
Total 12,126
KT MOS Bukbu Co.,Ltd. [member]  
Disclosure of detailed information about business combination [Line Items]  
Recognized amounts of identifiable assets acquired 14,924
Cash and cash equivalents 7,864
Trade and other receivables 4,827
Other current assets 160
Property and equipment 855
Intangible assets 997
Deferred income tax assets 113
Other non-currentassets 10
Other non-current financial assets 98
Recognized amounts of identifiable liabilities assumed 10,050
Trade and other payables 6,767
Other current liabilities 363
Current income tax liabilities 103
Post-employment benefit obligations 2,768
Other non-currentliabilities 49
Total 4,874
KTMOS Nambu Co.,Ltd. [member]  
Disclosure of detailed information about business combination [Line Items]  
Recognized amounts of identifiable assets acquired 12,242
Cash and cash equivalents 3,340
Trade and other receivables 6,318
Other current assets 85
Current income tax assets 75
Property and equipment 1,104
Intangible assets 478
Deferred income tax assets 576
Other non-current financial assets 266
Recognized amounts of identifiable liabilities assumed 6,433
Trade and other payables 3,327
Other current liabilities 703
Post-employment benefit obligations 2,360
Other non-currentliabilities 43
Total 5,809
CJ Digital Music Co., Ltd. [member]  
Disclosure of detailed information about business combination [Line Items]  
Recognized amounts of identifiable assets acquired 28,117
Cash and cash equivalents 1,556
Trade and other receivables 11,200
Other current assets 484
Inventories 5
Property and equipment 791
Intangible assets 1,860
Distribution agency contract (included in intangibles) 11,753
Contractual customer relationship (included in intangibles) 468
Recognized amounts of identifiable liabilities assumed 25,559
Trade and other payables 18,947
Other current liabilities 3,481
Post-employment benefit obligations 311
Deferred income tax liabilities 2,497
Other non-currentliabilities 323
Total ₩ 2,558