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Significant Operation Losses - Additional Information (Detail) - TWD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Sep. 30, 2018
Significant operation losses [line items] |  |
Loss from virus outbreak |  | $ 2,596.0
Estimated loss from unqualified photoresist materials | $ 3,400.0 |

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- Definition Estimated loss from unqualified photoresist materials. + References No definition available. + Details
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- Definition Loss from virus outbreak. + References No definition available. + Details
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Namespace Prefix: | tsm_
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- Definition Significant operation losses [line item]. + References No definition available. + Details
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