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SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES (Inventory valuation) (Details) $ in Millions	12 Months Ended
	Jan. 03, 2021 USD ($)
Disclosure of provision matrix [line items]
Increase (decrease) in allowance for expected credit loss related to ten percent adjustment in expected loss rate for all customers	$ 22.0
Increase (decrease) in expected selling price used to establish net realizable value of inventories	10.00%
Increase (decrease) in inventories related to ten percent adjustment in expected selling price	$ 5.3
Minimum
Disclosure of provision matrix [line items]
Expected credit loss rate	2.00%
Maximum
Disclosure of provision matrix [line items]
Expected credit loss rate	10.00%

X

- Definition

Increase (decrease) in allowance for expected credit loss related to ten percent adjustment in expected loss rate for all customers

+ References

No definition available.

+ Details

Name:	gil_IncreaseDecreaseInAllowanceForExpectedCreditLossRelatedToTenPercentAdjustmentInExpectedLossRateForAllCustomers
Namespace Prefix:	gil_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Increase (Decrease) In Expected Selling Price Used To Establish Net Realizable Value Of Inventories

+ References

No definition available.

+ Details

Name:	gil_IncreaseDecreaseInExpectedSellingPriceUsedToEstablishNetRealizableValueOfInventories
Namespace Prefix:	gil_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Increase (decrease) in inventories related to ten percent adjustment in expected selling price

+ References

No definition available.

+ Details

Name:	gil_Increasedecreaseininventoriesrelatedtotenpercentadjustmentinexpectedsellingprice
Namespace Prefix:	gil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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
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X

- Definition

The rate of expected credit losses, calculated as percentage of the gross carrying amount. Expected credit losses are the weighted average of credit losses with the respective risks of a default occurring as the weights.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph IG20D
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_IG20D&doctype=Implementation%20Guidance
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 35N
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35N&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Period Type:

X

- Details

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