Income taxes - Narrative (Details) $ in Millions	12 Months Ended
Nov. 30, 2023 USD ($)
Loss carry-forwards	$ 214.0
Operating loss carry-forwards limitations	Future use of U.S. loss carry-forwards is subject to certain limitations under provisions of the Internal Revenue Code including limitations subject to Section 382, which relates to a 50% change in control over a three-year period and are further dependent upon the Company attaining profitable operations. An ownership change under Section 382 occurred on January 22, 2009 regarding losses incurred by AGC, of which the attributes of those losses were transferred to Trilogy Metals US with the purchase of the mineral property in October 2011. Therefore, approximately $39.4 million of the U.S. losses above are subject to limitation under Section 382. Accordingly, the Company’s ability to use these losses may be limited.
Change In control percentage	50.00%
Operating losses that can be carried forward indefinitely	$ 30.8
Section 382
change in control, period	3 years
US losses subject to limitations \| Section 382
U.S. carryforward losses	$ 39.4

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Represents the change in control time period.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-6

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-Name Accounting Standards Codification
-Topic 740
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-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-8

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

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A description of the limitations on the use of all operating loss carryforwards available to reduce future taxable income.

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