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ENTITY-WIDE DISCLOSURES (Major customers as a percentage of net sales) (Details) | 12 Months Ended
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Dec. 30, 2018 | Dec. 31, 2017
Customer A |  |
Disclosure of major customers [line items] |  |
Percentage of total net sales | 19.00% | 16.50%
Customer B |  |
Disclosure of major customers [line items] |  |
Percentage of total net sales | 10.00% | 7.60%

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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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Namespace Prefix: | ifrs-full_
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Balance Type: | na
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 2017-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_34&doctype=Standard -URIDate 2017-03-09 + Details
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Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |