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EARNINGS PER SHARE - Potentially Anti-Dilutive Ordinary Shares Excluded from the Weight Average Number of Ordinary Shares for Diluted Earnings Per Share (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings per share [abstract] |  |  |
Shares deemed to be issued in respect of employee options excluded from calculation of EPS (in shares) | 4,470 | 205,940 | 603,159

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- Definition Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount + References No definition available. + Details
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Namespace Prefix: | glob_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_EarningsPerShareAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration