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Hedging Derivative Financial Instruments - Summary of Outstanding Forward Exchange Contracts (Detail) - Sell NT$/Buy EUR [member] € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 TWD ($)	Dec. 31, 2016 TWD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 EUR (€)
Disclosure of detailed information about financial instruments [line items]
Maturity Date		2017-01
Bottom of range [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2018-01
Top of range [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2018-02
Hedging instruments [member] | Bottom of range [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2018-02
Hedging instruments [member] | Top of range [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2018-05
Sell [member]
Disclosure of detailed information about financial instruments [line items]
Contract Amount | $	$ 6,002.8	$ 5,393.3
Sell [member] | Hedging instruments [member]
Disclosure of detailed information about financial instruments [line items]
Contract Amount | $	$ 2,649.1
Buy [member]
Disclosure of detailed information about financial instruments [line items]
Contract Amount | €			€ 169.0	€ 159.4
Buy [member] | Hedging instruments [member]
Disclosure of detailed information about financial instruments [line items]
Contract Amount | €			€ 75.0

X

- Definition

The amount of contractual undiscounted cash flows in relation to contractual amounts to be exchanged in a derivative financial instrument for which gross cash flows are exchanged. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph B11D
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_B11D_d&doctype=Appendix&seq=2
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

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- Definition

Derivative maturity date month and year.

+ References

No definition available.

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