XML 222 R203.htm IDEA: XBRL DOCUMENT v3.21.1
Financial Instruments - Summary of Financial Assets Measured at Level 3 Fair Value (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of fair value measurement of assets [line items]        
Beginning Balance $ 557,223,706      
Net increase in trade receivables (9,396,304) $ (334,626) $ 995,839 $ (9,313,539)
Exercise of call option (1,934,530) (68,894) (1,149,227) (1,269,680)
Ending Balance 583,576,894 20,782,653 557,223,706  
Available-for-sale [member] | Level 3 of fair value hierarchy [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 4,806,179 171,160 2,072,446  
Recognized in profit or loss (17,941) (639) 3,431  
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) (151,992) (5,413) (218,173)  
Recognized in other comprehensive income (effects of foreign currency exchange) (31,017) (1,105) (20,063)  
Net increase in trade receivables 6,005,816 213,883 3,171,205  
Trade receivables factoring (purchases) (7,409,093) (263,857) (1,141,515)  
Purchases 1,152,402 41,040 951,513  
Disposals (450,625) (16,048) (12,665)  
Exercise of call option (25,988) (926)    
Ending Balance 3,877,741 138,095 4,806,179 2,072,446
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVTPL equity instrument [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 1,005,714 35,816 475,123  
Recognized in profit or loss (17,941) (639) 3,431  
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) 0      
Recognized in other comprehensive income (effects of foreign currency exchange) (15,455) (550) (14,368)  
Net increase in trade receivables 0      
Trade receivables factoring (purchases) 0      
Purchases 893,234 31,810 541,528  
Disposals (329,370) (11,730)    
Exercise of call option (25,988) (926)    
Ending Balance 1,510,194 53,781 1,005,714 475,123
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVOCI equity instruments [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 755,903 26,920 580,399  
Recognized in profit or loss 0      
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) (149,856) (5,337) (216,121)  
Recognized in other comprehensive income (effects of foreign currency exchange) (15,562) (555) (5,695)  
Net increase in trade receivables 0      
Trade receivables factoring (purchases) 0      
Purchases 259,168 9,230 409,985  
Disposals (121,255) (4,318) (12,665)  
Ending Balance 728,398 25,940 755,903 580,399
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVOCI debt instruments [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 3,044,562 108,424 1,016,924  
Recognized in profit or loss 0      
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) (2,136) (76) (2,052)  
Recognized in other comprehensive income (effects of foreign currency exchange) 0      
Net increase in trade receivables 5,635,706 200,702 3,171,205  
Trade receivables factoring (purchases) (7,038,983) (250,676) (1,141,515)  
Purchases 0      
Disposals 0      
Ending Balance 1,639,149 58,374 $ 3,044,562 $ 1,016,924
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVTPL debt instrument [member]        
Disclosure of fair value measurement of assets [line items]        
Net increase in trade receivables 370,110 13,181    
Trade receivables factoring (purchases) $ (370,110) $ (13,181)