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v3.23.1

Equity Transaction with Non-controlling Interests - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, shares in Thousands, $ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2020 CNY (¥) | Dec. 31, 2021 TWD ($) shares | Sep. 30, 2020 $ / shares | Dec. 31, 2021 TWD ($) $ / shares shares | Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 TWD ($) shares | Sep. 30, 2022 USD ($) shares | Dec. 01, 2021 TWD ($) | Sep. 30, 2021 TWD ($) shares | Dec. 31, 2020 TWD ($) | Sep. 01, 2020 TWD ($) shares
USI Enterprise Limited ("USIE") [member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in capital surplus | $ |  | $ 2,093,787 |  | $ 2,093,787 |  |  |  |  | $ 47,171 |  | $ 2,760,175 | $ 780,533
Number of shares approved for repurchase | shares |  | 9,137 |  | 9,137 |  |  |  |  |  |  |  | 10,308
Shares repurchase price per share | $ / shares |  |  | $ 19.47 | $ 17.2 |  |  |  |  |  |  |  |
USI Enterprise Limited ("USIE") [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in shareholdings |  | 95.85% | 95.00% |  |  |  |  |  |  |  |  |
USI Enterprise Limited ("USIE") [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in shareholdings |  | 100.00% | 99.62% |  |  |  |  |  |  |  |  |
USISH [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in capital surplus |  | $ 436,927 |  | $ 436,927 | $ 211,184 | $ 6,872 | $ 8,963 | $ 292 |  | $ 11,277 |  |
Number of shares approved for repurchase | shares |  |  |  |  |  |  | 9,356 | 9,356 |  | 16,042 |  |
USIPL [Member] |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in capital surplus | $ |  |  |  |  |  |  |  |  |  |  | $ 13,502 |
Amount of shareholdings | ¥ | ¥ 24,500 |  |  |  |  |  |  |  |  |  |  |
Percentage of shareholdings | 40.00% |  |  |  |  |  |  |  |  |  |  |
USIPL [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in ownership | 60.00% |  |  |  |  |  |  |  |  |  |  |
USIPL [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in ownership | 100.00% |  |  |  |  |  |  |  |  |  |  |

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