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v3.19.3.a.u2

SIGNIFICANT ACCOUNTING POLICIES SIGNIGICANT ACCOUNTING POLICIES (Leases) (Details) | 12 Months Ended
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Dec. 29, 2019
Minimum |
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 | 15 years

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- Definition Lease Term, Right-Of-Use Asset + References No definition available. + Details
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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 domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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: |