Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Nov. 30, 2017	Feb. 01, 2018	May 31, 2017
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Nov. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Entity Registrant Name	Trilogy Metals Inc.
Entity Central Index Key	0001543418
Current Fiscal Year End Date	--11-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 39.4
Trading Symbol	TMQ
Entity Common Stock, Shares Outstanding		106,536,276