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Operating Lease Arrangements - Summary of Future Minimum Lease Payments of Non-cancellable Operating Lease Agreements (Lessee) (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2018 TWD ($)	Dec. 31, 2017 TWD ($)
Disclosure of finance lease and operating lease by lessee [line items]
Future minimum lease payments of non-cancellable operating lease commitments	$ 77,952	$ 2,386,102	$ 1,104,666
Less than 1 year [member]
Disclosure of finance lease and operating lease by lessee [line items]
Future minimum lease payments of non-cancellable operating lease commitments	16,661	509,994	246,026
1-5 years [member]
Disclosure of finance lease and operating lease by lessee [line items]
Future minimum lease payments of non-cancellable operating lease commitments	27,066	828,482	439,408
More than 5 years [member]
Disclosure of finance lease and operating lease by lessee [line items]
Future minimum lease payments of non-cancellable operating lease commitments	$ 34,225	$ 1,047,626	$ 419,232

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- Definition

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No definition available.

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- Definition

The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2018-01-01
-Paragraph 35
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2018-03-02&anchor=para_35_a&doctype=Standard&book=b
-URIDate 2018-03-16

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