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Other Financial Assets - Additional Information (Detail)	Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial assets [abstract]
Corporate bonds annual interest rate	3.50%	3.50%

X

- Definition

Interest rate on unsecured subordinate corporate bonds.

+ References

No definition available.

+ Details

Name:	asx_InterestRateOnUnsecuredSubordinateCorporateBonds
Namespace Prefix:	asx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfFinancialAssetsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration