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EARNINGS PER SHARE (Narrative) (Details) - shares	12 Months Ended
	Dec. 29, 2024	Dec. 31, 2023
Stock options
Earnings per share [line items]
Shares excluded from calculation of earnings per share (in shares)	0	282,737

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- Definition

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount1

+ References

No definition available.

+ Details

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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
Balance Type:	na
Period Type:	duration

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- Details

Name:	gil_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities1Axis=gil_EmployeeStockOption1Member
Namespace Prefix:
Data Type:	na
Balance Type:
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