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Inventories - Cost of Inventories Recognized as an Expense (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)
Analysis of income and expense [abstract]
Cost of revenue	$ 19,777,825		$ 17,723,687	$ 18,611,515
Loss on abandonment	102		2,483	9,448
(Reversal of) allowance for inventory valuation and obsolescence loss	(26,114)		80,633	(15,956)
Cost of revenue	$ 19,751,813	$ 602,373	$ 17,806,803	$ 18,605,007

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- Definition

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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