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Inventories - Summary of Inventories (Detail) - TWD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disclosure of inventories [Line Items]
Raw materials	$ 3,207,177	$ 2,102,075
Gross carrying amount [member]
Disclosure of inventories [Line Items]
Raw materials	3,328,763	2,181,890
Allowance for impairment losses [member]
Disclosure of inventories [Line Items]
Raw materials	$ (121,586)	$ (79,815)

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- Definition

A classification of current inventory representing the amount of assets to be consumed in the production process or in the rendering of services. [Refer: Inventories]

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