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Inventories - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Classes of current inventories [abstract]
Write down of inventories		$ 1,542.8	$ 464.4
Reversal of write down of inventories	$ 840.9

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- Definition

The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories]

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- Definition

The amount recognised as a reduction in the amount of inventories recognised as an expense due to the reversal of any write-down of inventories resulting from an increase in net realisable value. [Refer: Inventories; Inventory write-down]

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