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Inventories - Cost of Inventories Recognized as an Expense (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Analysis of income and expense [abstract]
Cost of revenue	$ 17,723,687		$ 18,611,515	$ 20,103,735
Loss on abandonment	2,483		9,448	552
Allowance for (reversal of) inventory valuation and obsolescence loss	80,633		(15,956)	41,770
Cost of revenue	$ 17,806,803	$ 581,542	$ 18,605,007	$ 20,146,057

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The amount of inventories recognised as an expense during the period. [Refer: Inventories]

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The amount of all expenses directly or indirectly attributed to the goods or services sold. Attributed expenses include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, such as depreciation and maintenance of factory buildings and equipment used in the production process, unallocated production overheads, and abnormal amounts of production costs of inventories.

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The amount recognised resulting from the write-down of inventories to net realisable value or reversals of those write-downs. [Refer: Inventories]

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Loss on abandonment, inventory.

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