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Share-based Payments Arrangement - Black-Scholes Model and Binomial Option Pricing Model and Related Assumptions used to Evaluate Options and Fair Value of Options by CHIEF (Detail) - CHIEF Telecom Inc. (CHIEF) [Member]	Nov. 13, 2020 TWD ($) yr $ / shares	Oct. 31, 2018 TWD ($) yr $ / shares	Dec. 19, 2017 TWD ($) yr $ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Grant-date share price	$ 356	$ 166	$ 95.92
Exercise price	$ 206	$ 147	$ 147
Dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	0.18%	0.72%	0.62%
Expected life | yr	5	5	5
Expected volatility	34.61%	16.60%	17.35%
Weighted average fair value of grants | $	$ 173,893	$ 33,540	$ 2,318

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Share price per share.

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- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

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The option life of share options granted.

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

+ References

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The exercise price of share options granted.

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

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