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Inventories - Cost of Inventories Recognized as an Expense (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Analysis of income and expense [abstract]
Cost of revenue	$ 17,957,568		$ 16,372,032	$ 15,057,605
Loss on abandonment	5,323		12,369	5,497
Allowance for (reversal of) inventory valuation and obsolescence loss	16,317		27,341	(13,070)
Cost of revenue	$ 17,979,208	$ 640,285	$ 16,411,742	$ 15,050,032

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

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The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, 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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