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Effects on initial application of IFRS 16 - Information About Differences Between Operating Lease Commitments And Lease Liabilities (Details) - TWD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Statement [LineItems]        
Operating lease commitments disclosed by applying IAS 17 as of December 31, 2018       $ 320,214
Add: Lease payable recognized under finance lease by applying IAS 17 as of December 31, 2018       17,792
Less: Short-term leases       (28,121)
Add: Adjustments as a result of a different treatment of extension and termination options       874,298
Total lease contracts amount recognized as lease liabilities by applying IFRS 16 on January 1, 2019 $ 1,079,181 $ 917,452   $ 1,184,183
Lease liabilities recognized as of January 1, 2019 by applying IFRS 16 $ 870,495 $ 692,951    
Bottom of range [member]        
Statement [LineItems]        
Incremental borrowing interest rate at the date of initial application     1.7895% 1.7895%
Top of range [member]        
Statement [LineItems]        
Incremental borrowing interest rate at the date of initial application     3.9474% 3.9474%
Effects of adopting new standards [member]        
Statement [LineItems]        
Lease liabilities recognized as of January 1, 2019 by applying IFRS 16       $ 884,275