XML 100 R81.htm IDEA: XBRL DOCUMENT
v3.19.1

Significant Assets and Liabilities Denominated in Foreign Currencies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Text block [abstract] |
Summary of Significant Assets and Liabilities Denominated in Foreign Currencies | The significant financial assets and liabilities denominated in foreign currencies were as follows:
|  | Foreign Currencies (In Thousand) |  | Exchange Rate |  | Carrying Amount (In Thousand)
December 31, 2017 |  |  |  |  |  |
Monetary financial assets |  |  |  |  |  |
US$ |  | $ | 3,065,296 |  |  |  | US$1=NT$29.76 |  |  | $ | 91,223,195 |
US$ |  |  | 1,193,369 |  |  |  | US$1=CNY6.5342 |  |  |  | 35,514,653 |
JPY |  |  | 5,005,435 |  |  |  | JPY1=NT$0.2642 |  |  |  | 1,322,436 |
JPY |  |  | 8,113,284 |  |  |  | JPY1=US$0.0089 |  |  |  | 2,143,530 |
Monetary financial liabilities |  |  |  |  |  |  |  |  |  |  |  |
US$ |  |  | 2,902,995 |  |  |  | US$1=NT$29.76 |  |  |  | 86,393,137 |
US$ |  |  | 1,007,629 |  |  |  | US$1=CNY6.5342 |  |  |  | 29,987,042 |
JPY |  |  | 5,415,677 |  |  |  | JPY1=NT$0.2642 |  |  |  | 1,430,822 |
JPY |  |  | 8,598,832 |  |  |  | JPY1=US$0.0089 |  |  |  | 2,271,811 |
December 31, 2018 |  |  |  |  |  |
Monetary financial assets |  |  |  |  |  |
US$ |  |  | 3,730,484 |  |  |  | US$1=NT$30.715 |  |  |  | 114,581,814 |
US$ |  |  | 1,299,391 |  |  |  | US$1=CNY6.8632 |  |  |  | 39,910,801 |
JPY |  |  | 4,412,591 |  |  |  | JPY1=NT$0.2782 |  |  |  | 1,227,583 |
JPY |  |  | 6,568,657 |  |  |  | JPY1=US$0.0091 |  |  |  | 1,827,400 |
Monetary financial liabilities |  |  |  |  |  |  |  |  |  |  |  |
US$ |  |  | 3,361,523 |  |  |  | US$1=NT$30.715 |  |  |  | 103,249,185 |
US$ |  |  | 1,216,654 |  |  |  | US$1=CNY6.8632 |  |  |  | 37,369,521 |
JPY |  |  | 7,401,621 |  |  |  | JPY1=NT$0.2782 |  |  |  | 2,059,131 |
JPY |  |  | 7,035,704 |  |  |  | JPY1=US$0.0091 |  |  |  | 1,957,333 |
Summary of Realized and Unrealized Foreign Exchange Gain (Loss) | The significant realized and unrealized foreign exchange gain (loss) were as follows:
|  | For the Year Ended December 31
|  | 2016 |  | 2017 |  | 2018
Functional Currencies |  | Exchange Rate |  | Net Foreign Exchange Gain |  | Exchange Rate |  | Net Foreign Exchange Gain (Loss) |  | Exchange Rate |  | Net Foreign Exchange Loss
|  |  |  | NT$ |  |  |  | NT$ |  |  |  | NT$ |  | US$ (Note 4)
NT$ |  |  |  |  |  | $ | 1,494,044 |  |  |  |  |  |  | $ | 4,130,243 |  |  |  |  |  |  | $ | (849,234 | ) |  | $ | (27,744 | )
US$ |  |  | US$1=NT$32.25 |  |  |  | 203,258 |  |  |  | US$1=NT$29.76 |  |  |  | (244,802 | ) |  |  | US$1=NT$30.715 |  |  |  | (67,476 | ) |  |  | (2,204 | )
CNY |  |  | CNY1=NT$4.649 |  |  |  | 224,393 |  |  |  | CNY1=NT$4.5545 |  |  |  | (337,630 | ) |  |  | CNY1=NT$4.4753 |  |  |  | (120,005 | ) |  |  | (3,920 | )
|  |  |  |  |  | $ | 1,921,695 |  |  |  |  |  |  | $ | 3,547,811 |  |  |  |  |  |  | $ | (1,036,715 | ) |  | $ | ($33,868) |

X
- Definition Disclosure of assets and liabilities denominated in foreign currencies. + References No definition available. + Details
Name: | asx_DisclosureOfAssetsAndLiabilitiesDenominatedInForeignCurrenciesExplanatory
Namespace Prefix: | asx_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of Realized and Unrealized Foreign Exchange Gain and (Loss) + References No definition available. + Details
Name: | asx_DisclosureOfRealizedAndUnrealizedForeignExchangeGainAndLossExplanatory
Namespace Prefix: | asx_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Text block [abstract] + References No definition available. + Details
Name: | asx_TextBlockAbstract
Namespace Prefix: | asx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration