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Income Tax - Analysis of Deferred Income Tax Assets and Liabilities in Consolidated Statements of Financial Position (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Dec. 31, 2017
USD ($)
Deferred income tax assets (liabilities)        
Depreciation $ 8,401.3 $ 4,244.2    
Provision for sales returns and allowance 1,637.7 1,512.1    
Net defined benefit liability 975.3 939.5    
Unrealized loss on inventories 629.5 737.3    
Deferred compensation cost 266.5 378.7    
Others 195.2 445.1    
Operating loss carryforward   14.5    
Deferred income tax assets 12,105.5 8,271.4   $ 408.4
Unrealized exchange gains (169.5) (48.7)    
Available-for-sale financial assets (95.4) (92.5)    
Others (37.3)      
Deferred income tax liabilities (302.2) (141.2)   $ (10.2)
Deferred tax assets depreciation [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year 4,244.2 2,853.0 $ 1,011.1  
Recognized in Profit or loss 4,207.2 1,437.6 1,808.7  
Effect of Acquisition of Subsidiary     11.9  
Effect of Exchange Rate Changes (50.1) (46.4) 21.3  
Balance, End of Year 8,401.3 4,244.2 2,853.0  
Deferred tax assets provision for sales returns and allowance [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year 1,512.1 1,141.5 1,230.8  
Recognized in Profit or loss 130.0 371.5 (104.4)  
Effect of Acquisition of Subsidiary     13.8  
Effect of Exchange Rate Changes (4.4) (0.9) 1.3  
Balance, End of Year 1,637.7 1,512.1 1,141.5  
Deferred tax assets net defined benefit liability [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year 939.5 895.5 787.4  
Recognized in Profit or loss 5.2 (82.9) 8.8  
Recognized in Other Comprehensive Income 30.6 126.9 99.3  
Balance, End of Year 975.3 939.5 895.5  
Deferred tax assets unrealized loss on inventories [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year 737.3 622.8 591.9  
Recognized in Profit or loss (105.1) 115.5 25.1  
Effect of Acquisition of Subsidiary     4.1  
Effect of Exchange Rate Changes (2.7) (1.0) 1.7  
Balance, End of Year 629.5 737.3 622.8  
Deferred tax assets deferred compensation cost [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year 378.7 316.3 255.6  
Recognized in Profit or loss (83.1) 69.3 49.4  
Effect of Exchange Rate Changes (29.1) (6.9) 11.3  
Balance, End of Year 266.5 378.7 316.3  
Deferred tax assets goodwill from business combination [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year   10.0 195.4  
Recognized in Profit or loss   (9.8) (185.8)  
Effect of Exchange Rate Changes   (0.2) 0.4  
Balance, End of Year     10.0  
Deferred tax assets other [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year 445.1 531.4 749.6  
Recognized in Profit or loss (222.4) (77.5) (243.4)  
Effect of Acquisition of Subsidiary     0.2  
Effect of Exchange Rate Changes (27.5) (8.8) 25.0  
Balance, End of Year 195.2 445.1 531.4  
Deferred tax assets operating loss carryforward [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year 14.5 14.5 317.0  
Recognized in Profit or loss     (303.2)  
Effect of Disposal of Subsidiary (14.5)      
Effect of Exchange Rate Changes     0.7  
Balance, End of Year   14.5 14.5  
Deferred tax assets [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year 8,271.4 6,385.0 5,138.8  
Recognized in Profit or loss 3,931.8 1,823.7 1,055.2  
Recognized in Other Comprehensive Income 30.6 126.9 99.3  
Effect of Acquisition of Subsidiary     30.0  
Effect of Disposal of Subsidiary (14.5)      
Effect of Exchange Rate Changes (113.8) (64.2) 61.7  
Balance, End of Year 12,105.5 8,271.4 6,385.0  
Deferred tax liabilities available for sale financial assets [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year (92.5) (31.3) (15.3)  
Recognized in Other Comprehensive Income (2.9) (61.2) (16.0)  
Balance, End of Year (95.4) (92.5) (31.3)  
Unrealised foreign exchange gains (losses) [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year (48.7)   (184.4)  
Recognized in Profit or loss (120.8) (48.7) 184.4  
Balance, End of Year (169.5) (48.7)    
Deferred tax liabilities others [Member]        
Deferred income tax assets (liabilities)        
Recognized in Profit or loss (36.7)      
Recognized in Other Comprehensive Income (0.6)      
Balance, End of Year (37.3)      
Deferred tax liabilities [member]        
Deferred income tax assets (liabilities)        
Balance, Beginning of Year (141.2) (31.3) (199.7)  
Recognized in Profit or loss (157.5) (48.7) 184.4  
Recognized in Other Comprehensive Income (3.5) (61.2) (16.0)  
Balance, End of Year $ (302.2) $ (141.2) $ (31.3)