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SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES (Inventory valuation) (Details) $ in Millions | 12 Months Ended
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Jan. 02, 2022 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 | $ 30.9
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 | $ 2.7
Minimum |
Disclosure of provision matrix [line items] |
Expected credit loss rate | 1.00%
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
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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
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Increase (decrease) in inventories related to ten percent adjustment in expected selling price + References No definition available. + Details
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Namespace Prefix: | gil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- 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 2021-01-01 -Paragraph IG20D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_IG20D&doctype=Implementation%20Guidance -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard -URIDate 2021-03-24 + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
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Balance Type: |
Period Type: |