Corporate and Group Information - Additional Information (Detail) - ChipMOS TECHNOLOGIES (Shanghai) LTD. [member]	Mar. 31, 2017
Disclosure of corporate and group information [Line Items]
Percentage of equity interest in subsidiary sold	54.98%
Percentage of equity interest in subsidiary	45.02%

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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