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SIGNIFICANT ACCOUNTING POLICIES (Ownership percentage of principal subsidiaries) (Details)	12 Months Ended
	Jan. 03, 2021
Gildan Activewear SRL
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Yarns, LLC
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan USA Inc.
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Honduras Properties, S. de R.L.
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Apparel (Canada) LP
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Activewear (UK) Limited
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Textiles de Sula, S. de R.L.
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
G.A.B. Limited
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Activewear Honduras Textile Company, S. de R.L.
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Activewear (Eden) Inc.
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Hosiery Rio Nance, S. de R.L.
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Mayan Textiles, S. de R.L.
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Charleston Inc.
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Activewear Dominican Republic Textile Company Inc.
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Honduras Trading, S. de R. L.
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%
Gildan Choloma Textiles, S. de R. L.
Disclosure of subsidiaries [line items]
Ownership percentage	100.00%
Ownership percentage	100.00%

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.

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- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 17
-Subparagraph b
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 16
-Subparagraph b
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2019-01-01
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-URIDate 2019-03-27

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