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TRADE ACCOUNTS RECEIVABLE (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 02, 2022 | Jan. 03, 2021
Subclassifications of assets, liabilities and equities [abstract] |  |
Trade accounts receivables being serviced under a receivables purchase agreement | $ 144.9 | $ 145.2
Receivables purchase agreement, maximum of sale of accounts receivables | 225.0 |
Receivables purchase agreement, difference between carrying amount of receivable sold and cash received | $ 1.6 | $ 2.0

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- Definition Receivables Purchase Agreement, Difference Between Carrying Amount Of Receivables Sold And Cash Received + References No definition available. + Details
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- Definition Receivables Purchase Agreement, Portion Of Current Trade Receivables + References No definition available. + Details
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Namespace Prefix: | gil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Receivables Purchase Agreement, Sale Of Accounts Receivable Maximum + References No definition available. + Details
Name: | gil_ReceivablesPurchaseAgreementSaleOfAccountsReceivableMaximum
Namespace Prefix: | gil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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