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TRADE ACCOUNTS RECEIVABLE (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 29, 2019 | Dec. 30, 2018
Subclassifications of assets, liabilities and equities [abstract] |  |
Trade accounts receivables being serviced under a receivables purchase agreement | $ 141,000,000 | $ 117,000,000
Receivables purchase agreement, maximum of sale of accounts receivables | 175,000,000 |
Receivables purchase agreement, difference between carrying amount of receivable sold and cash received | 3,200,000 | $ 2,600,000
Receivership and liquidation of distributor | $ 22.3 |

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- Definition Impairment Of Trade Accounts Receivable, Receivership and Liquidation Of Distributor + References No definition available. + Details
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Namespace Prefix: | gil_
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Balance Type: | debit
Period Type: | duration

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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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Namespace Prefix: | gil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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