v3.26.1
Business Combinations - Summary of Assets Acquired and Liabilities Assumed at the Date of Acquisition (Detail)
$ in Thousands
Dec. 31, 2025
TWD ($)
HIRSCHMANN [Member]  
Disclosure of detailed information about business combination [Line Items]  
Cash and cash equivalents $ 118,419
Trade and other receivables 1,336,203
Inventories 1,079,301
Property, plant and equipment 745,660
Right-of-use assets 143,629
Others 167,521
Trade and other payables (745,653)
Lease liabilities (143,629)
Net defined benefit liabilities (204,975)
Others (200,276)
Fair value of identifiable net assets acquired 2,296,200
ASEPCAYMAN [Member]  
Disclosure of detailed information about business combination [Line Items]  
Cash and cash equivalents 404,573
Trade and other receivables 213,592
Inventories 58,564
Property, plant and equipment 919,648
Right-of-use assets 0
Others 69,707
Trade and other payables (263,095)
Lease liabilities 0
Net defined benefit liabilities (158,053)
Others (71,848)
Fair value of identifiable net assets acquired 1,173,088
CHE [Member]  
Disclosure of detailed information about business combination [Line Items]  
Cash and cash equivalents 1,381,103
Trade and other receivables 87,935
Inventories 112,115
Property, plant and equipment 421,792
Right-of-use assets 96,894
Others 197,450
Trade and other payables (200,453)
Lease liabilities (96,894)
Net defined benefit liabilities 0
Others (54,264)
Fair value of identifiable net assets acquired $ 1,945,678