Document and Entity Information - shares	9 Months Ended
	Aug. 31, 2019	Oct. 08, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Period End Date	Aug. 31, 2019
Document Fiscal Year Focus	2019
Entity Current Reporting Status	Yes
Document Fiscal Period Focus	Q3
Entity Registrant Name	Trilogy Metals Inc.
Entity Central Index Key	0001543418
Current Fiscal Year End Date	--11-30
Entity Filer Category	Accelerated Filer
Title of 12(b) Security	Common Shares
Trading Symbol	TMQ
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		140,003,741
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Shell Company	false