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EARNINGS PER SHARE (Narrative) (Details) - shares | 12 Months Ended
--- | ---
Dec. 29, 2024 | Dec. 31, 2023
Stock options |  |
Earnings per share [line items] |  |
Shares excluded from calculation of earnings per share (in shares) | 0 | 282,737

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- Definition Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount1 + References No definition available. + Details
Name: | gil_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount1
Namespace Prefix: | gil_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | gil_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities1Axis=gil_EmployeeStockOption1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |