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SIGNIFICANT ACCOUNTING POLICIES SIGNIGICANT ACCOUNTING POLICIES (Leases) (Details) | 12 Months Ended
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Jan. 02, 2022
Bottom of range [member] |
Disclosure of quantitative information about right-of-use assets [line items] |
Lease term, right-of-use asset | 1 year
Maximum |
Disclosure of quantitative information about right-of-use assets [line items] |
Lease term, right-of-use asset | 18 years

X
- Definition Lease Term, Right-Of-Use Asset + References No definition available. + Details
Name: | gil_LeaseTermRightOfUseAsset
Namespace Prefix: | gil_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |