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v3.19.1

Related Party Transactions - Summary of Significant Transactions between the Company and Other Related Parties (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2018 USD ($)
Disclosure of transactions between related parties [line items] |  |  |  |
Net revenue from sale of goods | $ 8,980.4 | $ 8,496.1 | $ 5,929.1 |
Receivables from related parties | 584.4 | 1,184.1 |  | $ 19.1
Payables to related parties | 1,376.5 | 1,656.4 |  |
Other receivables from related parties | 65.0 | 171.1 |  | $ 2.1
Global Unichip Corporation [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Receivables from related parties | 481.9 | 1,022.9 |  |
Xintec Inc. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Receivables from related parties | 102.5 | 161.2 |  |
Payables to related parties | 649.8 | 817.9 |  |
Systems on Silicon Manufacturing Company Pte Ltd. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | 362.6 | 407.0 |  |
Other receivables from related parties | 53.8 | 83.1 |  |
Vanguard International Semiconductor Corporation [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | 357.1 | 410.0 |  |
Other receivables from related parties | 10.4 | 78.2 |  |
Associates [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Net revenue from sale of goods | 8,980.1 | 8,496.0 | 5,929.1 |
Net revenue from royalties | 362.3 | 482.5 | 516.7 |
Related Party Categories | 8,809.5 | 9,904.6 | 10,108.2 |
Manufacturing expenses | 2,974.6 | 2,196.1 | 1,389.2 |
Research and development expenses | 83.1 | 69.8 | 161.7 |
Other related parties [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Net revenue from sale of goods | 0.3 | 0.1 |  |
General and administrative expenses | 120.8 | 101.5 | $ 60.0 |
Other associates [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | 7.0 | 21.5 |  |
Other receivables from related parties | $ 0.8 | $ 9.8 |  |

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