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SIGNIFICANT ACCOUNTING POLICIES SIGNIGICANT ACCOUNTING POLICIES (Leases) (Details)	12 Months Ended
	Jan. 03, 2021
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	15 years

X

- 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

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: