XML 220 R201.htm IDEA: XBRL DOCUMENT
v3.19.1

Cash Flows Information - Change in Liabilities Arising From Financing Activities (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure Of Non Cash Investing Activities [line items] |  |  |
Beginning balance | $ 2,499,571 | $ 76,511,879 | $ 111,070,988
Financing cash flows | 3,320,914 | 101,653,172 | (19,636,346)
Non-cash changes |  |  |
Acquisition through business combinations (Note 30) | 789,192 | 24,157,174 |
Bonds conversion | (145,612) | (4,457,191) | (11,650,369)
Reclassification for applying IFRS 9 | (42,535) | (1,301,994) |
Amortization of issuance cost | 7,089 | 216,973 | 325,253
Effects of foreign currency exchange | 44,682 | 1,367,721 | (3,597,647)
Ending balance | 6,473,301 | 198,147,734 | 76,511,879
Short-term borrowings [member] |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |
Beginning balance | 586,817 | 17,962,471 | 20,955,522
Financing cash flows | 729,429 | 22,327,813 | (2,038,993)
Non-cash changes |  |  |
Acquisition through business combinations (Note 30) | 118,257 | 3,619,858 |
Reclassification for applying IFRS 9 | (42,535) | (1,301,994) |
Effects of foreign currency exchange | 21,409 | 655,321 | (954,058)
Ending balance | 1,413,377 | 43,263,469 | 17,962,471
Bonds payable [member] |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |
Beginning balance | 756,053 | 23,142,780 | 36,999,903
Financing cash flows | (202,078) | (6,185,600) | (1,123,972)
Non-cash changes |  |  |
Acquisition through business combinations (Note 30) | 145,612 | 4,457,191 |
Bonds conversion | (145,612) | (4,457,191) | (11,650,369)
Amortization of issuance cost | 940 | 28,756 | 319,463
Effects of foreign currency exchange |  |  | (1,402,245)
Ending balance | 554,915 | 16,985,936 | 23,142,780
Long-term borrowings [member] |  |  |
Disclosure Of Non Cash Investing Activities [line items] |  |  |
Beginning balance | 1,156,701 | 35,406,628 | 53,115,563
Financing cash flows | 2,793,563 | 85,510,959 | (16,473,381)
Non-cash changes |  |  |
Acquisition through business combinations (Note 30) | 525,323 | 16,080,125 |
Amortization of issuance cost | 6,149 | 188,217 | 5,790
Effects of foreign currency exchange | 23,273 | 712,400 | (1,241,344)
Ending balance | $ 4,505,009 | $ 137,898,329 | $ 35,406,628

X
- Definition Disclosure Of Non Cash Investing Activities [line items] + References No definition available. + Details
Name: | asx_DisclosureOfNonCashInvestingActivitiesLineItems
Namespace Prefix: | asx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Liabilities arising from financing activities amortization of issuance cost. + References No definition available. + Details
Name: | asx_LiabilitiesArisingFromFinancingActivitiesAmortizationOfIssuanceCost
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Liabilities arising from financing activities bonds conversion. + References No definition available. + Details
Name: | asx_LiabilitiesArisingFromFinancingActivitiesBondsConversion
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Liabilities Arising From Financing Activities Cash Flows + References No definition available. + Details
Name: | asx_LiabilitiesArisingFromFinancingActivitiesCashFlows
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Liabilities Arising From Financing Activities Foreign Exchange + References No definition available. + Details
Name: | asx_LiabilitiesArisingFromFinancingActivitiesForeignExchange
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Liabilities arising from financing activities reclassify for applying IFRS 9 + References No definition available. + Details
Name: | asx_LiabilitiesArisingFromFinancingActivitiesReclassifyForApplyingIFRS9
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Non cash changes. + References No definition available. + Details
Name: | asx_NonCashChangesAbstract
Namespace Prefix: | asx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in liabilities arising from financing activities resulting from obtaining or losing control of subsidiaries or other businesses. [Refer: Liabilities arising from financing activities; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 44B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_44B_b&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 44D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_44D&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_LiabilitiesArisingFromFinancingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=ifrs-full_ShorttermBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=asx_BondsPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=ifrs-full_LongtermBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |