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TRADE ACCOUNTS RECEIVABLE (Allowance for doubtful accounts) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2024 | Dec. 31, 2023
Changes in allowance account for credit losses of financial assets [abstract] |  |
Balance, beginning of fiscal year | $ (11,165) |
Balance, end of fiscal year | (11,061) | $ (11,165)
Allowance for doubtful accounts |  |
Changes in allowance account for credit losses of financial assets [abstract] |  |
Balance, beginning of fiscal year | (11,165) | (15,394)
(Impairment) Reversal of impairment of trade accounts receivable | (380) | 3,859
Write-off of trade accounts receivable | 484 | 370
Balance, end of fiscal year | $ (11,061) | $ (11,165)

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- Definition Allowance Account For Credit Losses, Financial Assets + References No definition available. + Details
Name: | gil_AllowanceAccountForCreditLossesFinancialAssets
Namespace Prefix: | gil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Increase (Decrease) Through Impairment Loss Recognised In Profit Or Loss, Allowance Account For Credit Losses Of Financial Assets + References No definition available. + Details
Name: | gil_IncreaseDecreaseThroughImpairmentLossRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | gil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (Decrease) Through Recovery (Expense) Recognized During Period For Bad And Doubtful Debts, Allowance Account For Credit Losses Of Financial Assets + References No definition available. + Details
Name: | gil_IncreaseDecreaseThroughRecoveryExpenseRecognizedDuringPeriodForBadAndDoubtfulDebtsAllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | gil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_TradeReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |