XML 162 R141.htm IDEA: XBRL DOCUMENT v3.22.1
Expenses by nature - Summary of Expenses by nature (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Analysis of income and expense [abstract]      
Raw materials and supplies used $ 5,518,145 $ 4,708,493 $ 3,575,283
Employee benefit expenses 6,757,888 6,010,227 6,075,773
Depreciation expenses 4,634,112 4,175,519 3,731,914
Others 5,053,088 4,686,218 4,590,720
Total operating costs and expenses $ 21,963,233 $ 19,580,457 $ 17,973,690