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Share capital - Narrative (Details)		12 Months Ended
Share capital - Narrative (Details)	Apr. 30, 2012 shares	Nov. 30, 2021 USD ($) $ / shares shares	Nov. 30, 2021 USD ($) $ / shares $ / shares shares	Nov. 30, 2020 USD ($) $ / shares shares	Nov. 30, 2020 USD ($) $ / shares shares	Nov. 30, 2019 USD ($) $ / shares shares	Nov. 30, 2019 USD ($) $ / shares shares	Nov. 30, 2021 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation \| $		$ (3,472,000)		$ (3,564,000)		$ (3,845,000)
Non-vested stock options outstanding		10,539,324	10,539,324
Weighted average exercise price options outstanding \| $ / shares								$ 1.99
Stock option expense not yet recognized \| $		$ 500,000	$ 500,000
Period for recognition of stock compensation expense		2 years
Aggregate intrinsic value, vested options \| $		$ 800,000	800,000	2,400,000	$ 2,400,000	7,200,000	$ 7,200,000
Aggregate intrinsic value, options exercised \| $		$ 1,400,000		$ 2,600,000		2,600,000
Rolling maximum number, percentage of the issued and outstanding Common Shares		10.00%
Warrants outstanding \| $		$ 0	$ 0
Exercise of warrants \| $						$ 9,900,000
Exercise of warrants (Shares)						6,521,740
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Rolling maximum number, percentage of the issued and outstanding Common Shares		10.00%
Share capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock committed for issuance		145,009,811	145,009,811	144,137,850	144,137,850	140,427,761	140,427,761
Exercise of warrants (Shares)						6,521,740
Nonvested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options outstanding		2,526,338	2,526,338
Weighted average exercise price options outstanding \| $ / shares		$ 2.06	$ 2.06
Restricted Share Units and Deferred Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, conversion		1
DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock committed for issuance		11,927	11,927
Granted units		58,925		83,775		137,514
Outstanding grants		1,277,445	1,277,445	1,218,520	1,218,520
Annual retainer percentage in DSUs		50.00%
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted units		0
NovaGold Arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, conversion	6
Common stock, terms of conversion	On April 30, 2012, under the NovaGold Arrangement, Trilogy committed to issue common shares to satisfy holders of NovaGold deferred share units (“NovaGold DSUs”), once vested, on record as of the close of business April 27, 2012. When vested, Trilogy committed to deliver one common share to the holder for every six shares of NovaGold the holder is entitled to receive, rounded down to the nearest whole number.
Common Stock, Other Shares, Outstanding		1,988	1,988
Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation \| $		$ 100,000		$ 500,000		$ 900,000
Stock Option.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation \| $		$ 3,300,000		$ 3,100,000		$ 2,900,000
Closing foreign exchange rate		0.7817	0.7817
Employees, consultants and directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted		3,374,150		4,445,000		3,077,500
Weighted-average exercise price \| $ / shares			$ 2.52		$ 2.79		$ 2.86
Stock options granted, weighted average fair value \| $ / shares		$ 0.84		$ 0.90		$ 1.03
Employees, consultants and directors \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years
Employees, consultants and directors \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		2 years