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BASIS OF PREPARATION - LEASES (Details) - IFRS 16 $ in Thousands	Dec. 31, 2018 USD ($)
Disclosure of quantitative information about right-of-use assets [line items]
Recognition exemption for short term leases	$ (6,930)
Termination and renewal options reasonably certain to be exercised, net	(1,888)
Other	(460)
Impact of discounting using the incremental borrowing rate at December 31, 2018	$ (16,129)

X

- Definition

Impact On Lease Obligations, Other

+ References

No definition available.

+ Details

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Namespace Prefix:	gil_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Impact of incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16

+ References

No definition available.

+ Details

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Namespace Prefix:	gil_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Termination and Renewal Options Reasonably Certain To Be Exercised, net

+ References

No definition available.

+ Details

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Namespace Prefix:	gil_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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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X

- Definition

The amount of the lease commitments for short-term leases accounted for applying paragraph 6 of IFRS 16. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

+ Details

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X

- Details

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