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v3.25.0.1

SIGNIFICANT ACCOUNTING POLICIES (Property, plant and equipment useful lives) (Details) | 12 Months Ended
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Dec. 29, 2024 | Dec. 31, 2022
Buildings and improvements | Bottom of range [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life | 5 years |
Buildings and improvements | Top of range [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life | 40 years |
Buildings and improvements | Majority, Bottom Of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life | 30 years |
Buildings and improvements | Majority, Top Of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life | 40 years |
Manufacturing equipment | Bottom of range [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life | 2 years |
Manufacturing equipment | Top of range [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life | 20 years |
Manufacturing equipment | Majority, Bottom Of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life |  | 15 years
Manufacturing equipment | Majority, Top Of Range |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life |  | 20 years
Other equipment | Bottom of range [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life | 3 years |
Other equipment | Top of range [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Useful life | 10 years |

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- Definition Useful Lives Or Depreciation Rates, Property, Plant And Equipment, Period + References No definition available. + Details
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Namespace Prefix: | gil_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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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: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_MachineryMember
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: |