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ENTITY-WIDE DISCLOSURES (Major customers as a percentage of net sales) (Details) | 12 Months Ended
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Dec. 29, 2019 | Dec. 30, 2018
Customer A |  |
Disclosure of major customers [line items] |  |
Percentage of total net sales | 18.60% | 19.00%
Customer B |  |
Disclosure of major customers [line items] |  |
Percentage of total net sales | 13.80% | 10.00%

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- 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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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition The percentage of the entity's revenue. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_34&doctype=Standard -URIDate 2019-03-27 + Details
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Period Type: | duration

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- Details
Name: | ifrs-full_MajorCustomersAxis=gil_CustomerAMember
Namespace Prefix: |
Data Type: | na
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- Details
Name: | ifrs-full_MajorCustomersAxis=gil_CustomerBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |