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Business Combination - Considerations Transferred Identifiable Assets Acquired and Liabilities Assumed at Acquisition Date (Detail) - KRW (₩)
₩ in Millions
Oct. 01, 2017
Sep. 01, 2017
SM LIFE DESIGN COMPANY JAPAN INC [member]    
Considerations paid:    
Cash and cash equivalents   ₩ 30,000
Assets and liabilities acquired:    
Cash and cash equivalents   3,434
Trade and other receivables   1,471
Inventories   1,879
Property and equipment   4
Intangible assets   6,677
Trade and other payables   (2,563)
Deferred tax liabilities   (2,324)
Other liabilities   (326)
Net assets   ₩ 8,252
S.M. Mobile Communications JAPAN Inc [member]    
Considerations paid:    
Shares of IRIVER LIMITED ₩ 24,650  
Assets and liabilities acquired:    
Cash and cash equivalents 4,112  
Trade and other receivables 237  
Property and equipment 311  
Intangible assets 7,445  
Other assets 41  
Trade and other payables (815)  
Other liabilities (154)  
Net assets ₩ 11,177